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{{Short description|Awareness of facts or being competent}}
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[[File:Tetradrachm Athens 480-420BC MBA Lyon.jpg|thumb|upright=1.1|alt=Coin showing the owl of Athena|The [[owl of Athena]], a symbol of knowledge in the Western world]]
{{Epistemology sidebar}}
'''Knowledge''' is an [[Declarative knowledge|awareness of facts]], a [[Knowledge by acquaintance|familiarity with individuals and situations]], or a [[Procedural knowledge|practical skill]]. Knowledge of facts, also called [[proposition]]al knowledge, is often characterized as [[Truth|true]] [[belief]] that is distinct from opinion or guesswork by virtue of [[Justification (epistemology)|justification]]. While there is wide agreement among philosophers that propositional knowledge is a form of true belief, many controversies focus on justification. This includes questions like how to understand justification, whether it is needed at all, and whether something else besides it is needed. These controversies intensified in the latter half of the 20th century due to a series of [[Gettier problem#Gettier's two original counterexamples|thought experiments]] that provoked alternative definitions.

Knowledge can be produced in many ways. The main source of [[empirical knowledge]] is [[perception]], which involves the usage of the [[senses]] to learn about the external world. [[Introspection]] allows people to learn about their internal [[mental states]] and processes. Other sources of knowledge include [[memory]], [[rational intuition]], [[inference]], and [[testimony]].{{efn|In this context, testimony is what other people report, both in spoken and written form.}} According to [[foundationalism]], some of these sources are basic in that they can justify beliefs, without depending on other mental states. [[Coherentism|Coherentists]] reject this claim and contend that a sufficient degree of coherence among all the mental states of the believer is necessary for knowledge. According to infinitism, an infinite chain of beliefs is needed.

The main discipline investigating knowledge is [[epistemology]], which studies what people know, how they come to know it, and what it means to know something. It discusses the value of knowledge and the thesis of [[philosophical skepticism]], which questions the possibility of knowledge. Knowledge is relevant to many fields like the [[science]]s, which aim to acquire knowledge using the [[scientific method]] based on repeatable [[experimentation]], [[observation]], and [[measurement]]. Various religions hold that humans should seek knowledge and that God or the divine is the source of knowledge. The anthropology of knowledge studies how knowledge is acquired, stored, retrieved, and communicated in different cultures. The [[sociology of knowledge]] examines under what sociohistorical circumstances knowledge arises, and what sociological consequences it has. The [[history of knowledge]] investigates how knowledge in different fields has developed, and evolved, in the course of history.

== Definitions ==
{{main|Definitions of knowledge}}

Knowledge is a form of familiarity, [[awareness]], [[understanding]], or acquaintance. It often involves the possession of information learned through [[experience]]<ref>{{multiref | {{harvnb|AHD staff|2022a}} | {{harvnb|MW Staff|2023}} | {{harvnb|CD staff}} }}</ref> and can be understood as a [[Cognition|cognitive]] success or an epistemic contact with reality, like making a discovery.<ref>{{multiref | {{harvnb|Zagzebski|1999|p=109}} | {{harvnb|Steup|Neta|2020|loc=Lead Section, § 1. The Varieties of Cognitive Success}} }}</ref> Many academic definitions focus on [[propositional knowledge]] in the form of believing certain facts, as in "I know that Dave is at home".<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.1 The Truth Condition, § 1.2 The Belief Condition}} | {{harvnb|Klein|1998|loc=§ 1. The Varieties of Knowledge}} | {{harvnb|Hetherington|2022a|loc=§ 1b. Knowledge-That}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} }}</ref> Other types of knowledge include knowledge-how in the form of practical [[Competence (human resources)|competence]], as in "she knows how to swim", and [[knowledge by acquaintance]] as a familiarity with the known object based on previous direct experience, like knowing someone personally.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1. Kinds of Knowledge}} | {{harvnb|Stanley|Willlamson|2001|pp=[https://philpapers.org/rec/WILKHV 411–412]}} | {{harvnb|Zagzebski|1999|p=92}} }}</ref>

Knowledge is often understood as a state of an individual person, but it can also refer to a characteristic of a group of people as group knowledge, social knowledge, or collective knowledge.<ref>{{multiref | {{harvnb|Klausen|2015|pp=[https://portal.findresearcher.sdu.dk/da/publications/bbee5873-28f2-46d5-94b6-49ef5b18a38b 813–818]}} | {{harvnb|Lackey|2021|pp=111–112}} }}</ref> Some social sciences understand knowledge as a broad social phenomenon that is similar to culture.<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Allen|2005|loc=§ Sociology of Knowledge}} | {{harvnb|Barth|2002|p=1}} }}</ref> The term may further denote knowledge stored in documents like the "knowledge housed in the library"<ref>{{multiref | {{harvnb|AHD staff|2022a}} | {{harvnb|Magee|Popper|1971|pp=[https://archive.org/details/modernbritishphi0000mage/page/74 74–75]}} }}</ref> or the [[knowledge base]] of an [[expert system]].<ref>{{multiref | {{harvnb|AHD staff|2022b}} | {{harvnb|Walton|2005|pp=59, 64}} }}</ref> Knowledge is closely related to [[intelligence]], but intelligence is more about the ability to acquire, process, and apply information, while knowledge concerns information and skills that a person already possesses.<ref>{{multiref | {{harvnb|Rothberg|Erickson|2005|pp=[https://books.google.com/books?id=GT7qIH4PPmMC 5, 14–15]}} | {{harvnb|Christopher|Prasath|Vanga|2018|pp=[https://books.google.com/books?id=9nSADwAAQBAJ&pg=PA93 93–94]}} | {{harvnb|AHD staff|2022a}} | {{harvnb|AHD staff|2022c}} }}</ref>

The word ''knowledge'' has its roots in the 12th-century [[Old English]] word {{lang|ang|cnawan}}, which comes from the [[Old High German]] word {{lang|goh|gecnawan}}.<ref>{{multiref | {{harvnb|Hoad|1993|pp=254–255}} | {{harvnb|Wise|2011|p=[https://books.google.com/books?id=EathAQAAQBAJ&pg=PT80 80]}} }}</ref> The English word includes various meanings that some other languages distinguish using several words. For example, Latin uses the words {{lang|la|cognitio}} and {{lang|la|scientia}} for "knowledge" while French uses the words {{lang|fr|connaitre}} and {{lang|fr|savoir}} for "to know".<ref>{{harvnb|Steup|Neta|2020|loc=§ 2. What Is Knowledge?}}</ref> The main discipline studying knowledge is called [[epistemology]] or the theory of knowledge. It examines the nature of knowledge and justification, how knowledge arises, and what value it has. Further topics include the different types of knowledge and the limits of what can be known.<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=Lead Section}} | {{harvnb|Truncellito|2023|loc=Lead Section}} | {{harvnb|Moser|2005|p=[https://books.google.com/books?id=5NJjAwAAQBAJ&pg=PA3 3]}} }}</ref>

Despite agreements about the general characteristics of knowledge, its exact definition is disputed. Some definitions only focus on the most salient features of knowledge to give a practically useful characterization.<ref>{{multiref | {{harvnb|Zagzebski|1999|p=99}} | {{harvnb|Hetherington|2022a|loc=§ 2. Knowledge as a Kind}} }}</ref> Another approach, termed ''analysis of knowledge'', tries to provide a theoretically precise definition by listing the conditions that are [[Necessity and sufficiency|individually necessary and jointly sufficient]],<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=Lead Section}} | {{harvnb|Hannon|2021|loc=Knowledge, Concept of}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} | {{harvnb|Zagzebski|1999|pp=92, 96–97}} }}</ref> similar to how [[Chemistry|chemists]] analyze a sample by seeking a list of all the chemical elements composing it.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=Lead Section}} | {{harvnb|Zagzebski|1999|p=96}} | {{harvnb|Gupta|2021}} }}</ref> According to a different view, knowledge is a unique state that cannot be analyzed in terms of other phenomena.<ref>{{harvnb|Ichikawa|Steup|2018|loc=§ 7. Is Knowledge Analyzable?}}</ref> Some scholars base their definition on abstract intuitions while others focus on concrete cases<ref>{{multiref | {{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 3 Defining knowledge]}} | {{harvnb|McCain|2022|loc=Lead Section, § 2. Chisholm on the Problem of the Criterion}} | {{harvnb|Fumerton|2008|pp=[https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780195183214.001.0001/oxfordhb-9780195183214-e-3 34–36]}} }}</ref> or rely on how the term is used in [[ordinary language]].<ref>{{multiref | {{harvnb|Stroll|2023|loc=§ The Origins of Knowledge, § Analytic Epistemology}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} | {{harvnb|García-Arnaldos|2020|p=[https://brill.com/view/journals/hpla/23/2/article-p507_11.xml 508]}}}}</ref> There is also disagreement about whether knowledge is a rare phenomenon that requires absolute [[certainty]] or a common phenomenon found in many everyday situations.<ref>{{multiref | {{harvnb|Hetherington|loc=§ 8. Implications of Fallibilism: No Knowledge?}} | {{harvnb|Hetherington|2022a|loc=§ 6. Standards for Knowing}} | {{harvnb|Black|2002|pp=[https://www.pdcnet.org/swphilreview/content/swphilreview_2002_0018_0001_0023_0032 23–32]}} }}</ref>

=== Justified true belief ===
{{See also|Belief#Justified true belief|Definitions of knowledge#Justified true belief}}
[[File:Justified true belief.png|thumb|alt=Venn diagram of justified true belief|The definition of knowledge as justified true belief is often discussed in the academic literature.]]
An often-discussed definition characterizes knowledge as justified true belief (JTB). This definition identifies three essential features: it is (1) a [[belief]] that is (2) [[Truth|true]] and (3) [[Justification (epistemology)|justified]].<ref>{{multiref | {{harvnb|Klein|1998|loc=Lead Section, § 3. Warrant}} | {{harvnb|Zagzebski|1999|pp=99–100}} }}</ref>{{efn|A similar approach was already discussed in [[Ancient Greek philosophy]] in Plato's dialogue ''[[Theaetetus (dialogue)|Theaetetus]]'', where [[Socrates]] pondered the distinction between knowledge and true belief but rejected the JTB definition of knowledge.<ref>{{multiref | {{harvnb|Allen|2005|loc=Lead Section, § Gettierology}} | {{harvnb|Parikh|Renero|2017|pp=[https://link.springer.com/chapter/10.1007/978-3-319-53280-6_4 93–102]}} | {{harvnb|Chappell|2019|loc=§ 8. Third Definition (D3): 'Knowledge Is True Judgement With an Account': 201d–210a}} }}</ref>}} Truth is a widely accepted feature of knowledge. It implies that, while it may be possible to believe something false, one cannot know something false.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.1 The Truth Condition}} | {{harvnb|Hetherington|2022a|loc=§ 1b. Knowledge-That, § 5. Understanding Knowledge?}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} }}</ref>{{efn|Truth is usually associated with [[Subjectivity and objectivity (philosophy)|objectivity]]. This view is rejected by [[factual relativism|relativism about truth]], which argues that what is true depends on one's perspective and that there is no view from nowhere.<ref>{{multiref | {{harvnb|Landau|2017|pp=[https://books.google.com/books?id=fDoqDwAAQBAJ&pg=PA119 119–120]}} | {{harvnb|O'Grady}} }}</ref>}} That knowledge is a form of belief implies that one cannot know something if one does not believe it. Some everyday expressions seem to violate this principle, like the claim that "I do not believe it, I know it!" But the point of such expressions is usually to emphasize one's confidence rather than denying that a belief is involved.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.2 The Belief Condition}} | {{harvnb|Klein|1998|loc=§ 1. The Varieties of Knowledge}} | {{harvnb|Zagzebski|1999|p=93}} }}</ref>

The main controversy surrounding the JTB definition concerns its third feature: justification.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.3 The Justification Condition, § 6. Doing Without Justification?}} | {{harvnb|Klein|1998|loc=Lead Section, § 3. Warrant}} | {{harvnb|Zagzebski|1999|p=100}} }}</ref> This component is often included because of the impression that some true beliefs are not forms of knowledge. Specifically, this covers cases of [[superstition]], [[luck]]y guesses, or erroneous [[reasoning]]. For example, a person who is convinced that a coin flip will land heads usually does not know that even if their belief turns out to be true. This indicates that there is more to knowledge than just being right about something.<ref>{{multiref | {{harvnb|Klein|1998|loc=§ 2. Propositional Knowledge Is Not Mere True Belief, § 3. Warrant}} | {{harvnb|Hetherington|2022a|loc=§ 5a. The Justified-True-Belief Conception of Knowledge, § 6e. Mere True Belief}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.3 The Justification Condition}} }}</ref> The JTB definition excludes these cases by identifying justification as an additional component needed.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.3 The Justification Condition}} | {{harvnb|Klein|1998|loc=§ 3. Warrant}} | {{harvnb|Hetherington|2022a|loc=§ 5a. The Justified-True-Belief Conception of Knowledge, § 6e. Mere True Belief}} }}</ref> There are disagreements about what justification means. According to one view, a belief is justified if it is [[Evidentialism|based on evidence]], which can take the form of [[mental states]] like experience, [[memory]], and other beliefs. A different view states that beliefs are justified if they are produced by [[Reliabilism|reliable]] processes, like sensory perception and logical reasoning.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 1.3 The Justification Condition, § 6.1 Reliabilist Theories of Knowledge}} | {{harvnb|Klein|1998|loc=§ 4. Foundationalism and Coherentism, § 6. Externalism}} | {{harvnb|Hetherington|2022a|loc=§ 5a. The Justified-True-Belief Conception of Knowledge, § 7. Knowing’s Point}} }}</ref>

=== Gettier problem and alternatives ===
{{Main|Gettier problem}}
[[File:Justified True Belief model of knowledge.svg|thumb|upright=1.3|alt=Venn diagram of justified true belief that does not amount to knowledge|The Gettier problem is motivated by the idea that some justified true beliefs do not amount to knowledge.]]
The JTB definition came under severe criticism in the 20th century, when epistemologist [[Edmund Gettier]] formulated a series of counterexamples.<ref>{{harvnb|Hetherington|2022|loc=Lead Section, § Introduction}}</ref> They purport to present concrete cases of justified true beliefs that fail to constitute knowledge. The reason for their failure is usually a form of epistemic luck: the beliefs are justified but their justification is not relevant to the truth.<ref>{{multiref | {{harvnb|Klein|1998|loc=§ 5. Defeasibility Theories}} | {{harvnb|Hetherington|2022a|loc=§ 5. Understanding Knowledge?}} | {{harvnb|Zagzebski|1999|p=100}} }}</ref> In a well-known example, someone drives along a country road with many [[Potemkin village|barn facades]] and only one real barn. The person is not aware of this, stops in front of the real barn by a lucky coincidence, and forms the justified true belief that they are in front of a barn. This example aims to establish that the person does not know that they are in front of a real barn, since they would not have been able to tell the difference.<ref>{{multiref | {{harvnb|Rodríguez|2018|pp=29–32}} | {{harvnb|Goldman|1976|pp=771–773}} | {{harvnb|Sudduth|2022}} | {{harvnb|Ichikawa|Steup|2018|loc=§ 10.2 Fake Barn Cases}} }}</ref> This means that it is a lucky coincidence that this justified belief is also true.<ref>{{harvnb|Ichikawa|Steup|2018|loc=§ 3. The Gettier Problem, § 10.2 Fake Barn Cases}}</ref>

The responses to this and other counterexamples have been diverse. According to some, they show that the JTB definition of knowledge is deeply flawed and that a radical reconceptualization of knowledge is necessary, often by denying justification a role.<ref>{{harvnb|Ichikawa|Steup|2018|loc=§ 3. The Gettier Problem, § 4. No False Lemmas, § 5. Modal Conditions, § 6. Doing Without Justification?}}</ref> This can happen, for example, by replacing the justification condition with reliability or by seeing knowledge as the manifestation of [[Intellectual virtue|cognitive virtue]]s. Another approach defines knowledge in regard to the function it plays in cognitive processes as, that which provides reasons for thinking or doing something.<ref>{{harvnb|Steup|Neta|2020|loc=§ 2.3 Knowing Facts}}</ref> Responses on the other half of the spectrum hold that Gettier cases pose no serious problems and no radical reconceptualization is required. They usually focus on minimal modifications of the JTB definition, for example, by making small adjustments to how justification is defined.<ref>{{harvnb|Ichikawa|Steup|2018|loc=§ 3. The Gettier Problem, § 7. Is Knowledge Analyzable?}}</ref>

Responses between these two camps acknowledge that Gettier cases pose a problem and suggest a moderate departure from the JTB definition. They hold that a fourth feature besides justification, truth, and belief is required.<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 3. The Gettier Problem, § 7. Is Knowledge Analyzable?}} | {{harvnb|Durán|Formanek|2018|pp=648–650}} }}</ref> Many candidates for the fourth feature have been suggested, like the requirements that the justified true belief does not depend on any false beliefs, that no [[defeater]]s{{efn|A defeater of a belief is evidence that this belief is false.<ref>{{harvnb|McCain|Stapleford|Steup|2021|p=[https://books.google.com/books?id=IeNBEAAAQBAJ&pg=PT111 111]}}</ref>}} are present, or that the person would not have the belief if it was false.<ref>{{multiref | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} | {{harvnb|Sudduth|2022}} }}</ref> Another view states that beliefs have to be infallible to amount to knowledge.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 5c. Questioning the Gettier Problem, § 6. Standards for Knowing}} | {{harvnb|Kraft|2012|pp=[https://philpapers.org/rec/KRASIF 49–50]}} }}</ref> One difficulty with this position is that it may imply that very few beliefs, if any, would amount to knowledge.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 5c. Questioning the Gettier Problem, § 6. Standards for Knowing}} | {{harvnb|Zagzebski|1999|pp=103–104}} | {{harvnb|Sidelle|2001|p=[https://philpapers.org/rec/SIDAAT 163]}} }}</ref> There is still very little consensus in the academic discourse as to which of the proposed modifications or reconceptualizations is correct, and there are various [[Definitions of knowledge#Other definitions|alternative definitions of knowledge]].<ref>{{multiref | {{harvnb|Ichikawa|Steup|2018|loc=§ 3. The Gettier Problem, § 7. Is Knowledge Analyzable?}} | {{harvnb|Zagzebski|1999|pp=93–94, 104–105}} | {{harvnb|Steup|Neta|2020|loc=§ 2.3 Knowing Facts}} }}</ref>

== Types ==
A common distinction among types of knowledge is between propositional knowledge, or knowledge-that, and non-propositional knowledge in the form of practical skills or acquaintance.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1. Kinds of Knowledge}} | {{harvnb|Ronald|1990|p=[https://books.google.com/books?id=eTjlAAAAQBAJ&pg=PA40 40]}} | {{harvnb|Lilley|Lightfoot|Amaral|2004|pp=[https://books.google.com/books?id=HT8VDAAAQBAJ&pg=PA162 162–163]}} }}</ref>{{efn|A distinction similar to the one between knowledge-that and knowledge-how was already discussed in ancient Greece as the contrast between ''[[Episteme|epistēmē]]'' (unchanging theoretical knowledge) and ''[[Techne|technē]]'' (expert technical knowledge).<ref>{{harvnb|Allen|2005|loc=Lead Section}}</ref>}} Other distinctions focus on how the knowledge is acquired and on the content of the known information.<ref>{{multiref | {{harvnb|Baehr|2022|loc=Lead Section}} | {{harvnb|Faber|Maruster|Jorna|2017|p=[https://books.google.com/books?id=KKo0DwAAQBAJ&pg=PT340 340]}} | {{harvnb|Gertler|2021|loc=Lead Section}} | {{harvnb|Rescher|2005|p=[https://books.google.com/books?id=o7m3amAbDEsC&pg=PA20 20]}} }}</ref>

=== Propositional ===
{{main|Declarative knowledge}}
[[File:Latin dictionary.jpg|thumb|alt=Photo of the Totius Latinitatis Lexicon by Egidio Forcellini, a multi-volume Latin dictionary|Declarative knowledge can be expressed using declarative sentences stored in books.]]

Propositional knowledge, also referred to as declarative and descriptive knowledge, is a form of theoretical knowledge about facts, like knowing that "2 + 2 = 4". It is the paradigmatic type of knowledge in analytic philosophy.<ref>{{multiref | {{harvnb|Klein|1998|loc=§ 1. The Varieties of Knowledge}} | {{harvnb|Hetherington|2022a|loc=§ 1b. Knowledge-That}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} }}</ref> Propositional knowledge is ''propositional'' in the sense that it involves a relation to a proposition. Since propositions are often expressed through that-clauses, it is also referred to as ''knowledge-that'', as in "Akari knows that kangaroos hop".<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1b. Knowledge-That}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} | {{harvnb|Zagzebski|1999|p=92}} }}</ref> In this case, Akari stands in the [[Relation (philosophy)|relation]] of knowing to the proposition "kangaroos hop". Closely related types of knowledge are ''know-wh'', for example, ''knowing who'' is coming to dinner and ''knowing why'' they are coming.<ref>{{harvnb|Hetherington|2022a|loc=§ 1b. Knowledge-That, § 1c. Knowledge-Wh}}</ref> These expressions are normally understood as types of propositional knowledge since they can be paraphrased using a that-clause.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1c. Knowledge-Wh}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} }}</ref>

Propositional knowledge takes the form of mental representations involving concepts, ideas, theories, and general rules. These representations connect the knower to certain parts of reality by showing what they are like. They are often context-independent, meaning that they are not restricted to a specific use or purpose.<ref>{{multiref | {{harvnb|Morrison|2005|p=[https://books.google.com/books?id=znbkHaC8QeMC&pg=PA371 371]}} | {{harvnb|Reif|2008|p=33}} | {{harvnb|Zagzebski|1999|p=93}} }}</ref> Propositional knowledge encompasses both knowledge of specific facts, like that the atomic mass of gold is 196.97 [[Dalton (unit)|u]], and general laws, like that the color of leaves of some trees changes in autumn.<ref>{{harvnb|Woolfolk|Margetts|2012|p=[https://books.google.com/books?id=whziBAAAQBAJ&pg=PA251 251]}}</ref> Because of the dependence on mental representations, it is often held that the capacity for propositional knowledge is exclusive to relatively sophisticated creatures, such as humans. This is based on the claim that advanced intellectual capacities are needed to believe a proposition that expresses what the world is like.<ref name="auto6">{{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 1 Some preliminaries]}}</ref>

=== Non-propositional ===
[[File:Bicycle ride.jpg|thumb|alt=Photograph of someone riding a bicycle|Knowing how to ride a bicycle is one form of non-propositional knowledge.]]
Non-propositional knowledge is knowledge in which no essential relation to a proposition is involved. The two most well-known forms are knowledge-how (know-how or [[procedural knowledge]]) and knowledge by acquaintance.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1. Kinds of Knowledge}} | {{harvnb|Stroll|2023|loc=§ The Nature of Knowledge}} | {{harvnb|Stanley|Willlamson|2001|pp=[https://philpapers.org/rec/WILKHV 411–412]}} }}</ref> To possess knowledge-how means to have some form of practical [[ability]], skill, or [[Competence (human resources)|competence]],<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1d. Knowing-How}} | {{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 1 Some preliminaries]}} }}</ref> like knowing how to ride a bicycle or knowing how to swim. Some of the abilities responsible for knowledge-how involve forms of knowledge-that, as in knowing how to prove a [[Mathematics|mathematical]] theorem, but this is not generally the case.<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=§ 2.2 Knowing How}} | {{harvnb|Pavese|2022|loc=Lead Section, § 6. The Epistemology of Knowledge-How}} }}</ref> Some types of knowledge-how do not require a highly developed mind, in contrast to propositional knowledge, and are more common in the animal kingdom. For example, an [[ant]] knows how to walk even though it presumably lacks a mind sufficiently developed to represent the corresponding proposition.<ref name="auto6"/>{{efn|However, it is controversial to what extent goal-directed behavior in lower animals is comparable to human knowledge-how.{{sfn|Pavese|2022|loc=§ 7.4 Knowledge-How in Preverbal Children and Nonhuman Animals}}}}

Knowledge by acquaintance is familiarity with something that results from direct experiential contact.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 1a. Knowing by Acquaintance}} | {{harvnb|Stroll|2023|loc=§ St. Anselm of Canterbury}} | {{harvnb|Zagzebski|1999|p=92}} }}</ref> The object of knowledge can be a person, a thing, or a place. For example, by eating chocolate, one gets knowledge by acquaintance of chocolate and visiting [[Lake Taupō]] leads to the formation of knowledge of acquaintance of Lake Taupō. In these cases, the person forms non-inferential knowledge based on first-hand experience without necessarily acquiring factual information about the object. By contrast, it is also possible to indirectly learn a lot of propositional knowledge about chocolate or Lake Taupō by reading books without having the direct experiential contact required for knowledge by acquaintance.<ref>{{multiref | {{harvnb|Peels|2023|p=[https://books.google.com/books?id=acCpEAAAQBAJ&pg=PA28 28]}} | {{harvnb|Heydorn|Jesudason|2013|p=[https://books.google.com/books?id=6QDqPIsiEXEC&pg=PT10 10]}} | {{harvnb|Foxall|2017|p=[https://books.google.com/books?id=HSE6DwAAQBAJ&pg=PT75 75]}} | {{harvnb|Hasan|Fumerton|2020}} | {{harvnb|DePoe|2022|loc=Lead Section, § 1. The Distinction: Knowledge by Acquaintance and Knowledge by Description}} | {{harvnb|Hetherington|2022a|loc=§ 1a. Knowing by Acquaintance}} }}</ref> Knowledge by acquaintance plays a central role in [[Bertrand Russell]]'s epistemology. He holds that it is more basic than propositional knowledge since to understand a proposition, one has to be acquainted with its constituents, like the [[Universal (metaphysics)|universals]] and [[particular]] objects it refers to.<ref>{{multiref |1={{harvnb|Hasan|Fumerton|2020|loc=[https://plato.stanford.edu/entries/knowledge-acquaindescrip/ introduction]}} |2={{harvnb|Haymes|Özdalga|2016|pp=[https://books.google.com/books?id=iz6uCwAAQBAJ&pg=PA27 26–28]}} |3={{harvnb|Miah|2006|pp=[https://books.google.com/books?id=l7KvAwAAQBAJ&pg=PA19 19–20]}} |4={{harvnb|Alter|Nagasawa|2015|pp=[https://books.google.com/books?id=FgPWBgAAQBAJ&pg=PA93 93–94]}} |5={{harvnb|Hetherington|2022a|loc=§ 1a. Knowing by Acquaintance}}}}</ref>

=== ''A priori'' and ''a posteriori'' ===
{{main|A priori and a posteriori}}
The distinction between ''a priori'' and ''a posteriori'' knowledge depends on the role of experience in the processes of formation and justification.<ref>{{multiref | {{harvnb|Stroll|2023|loc=§ A Priori and a Posteriori Knowledge}} | {{harvnb|Baehr|2022|loc=Lead Section}} | {{harvnb|Russell|2020|loc=Lead Section}} }}</ref> To know something ''a posteriori'' means to know it based on experience.<ref>{{multiref | {{harvnb|Baehr|2022|loc=Lead Section}} | {{harvnb|Moser|2016|loc=Lead Section}} }}</ref> For example, by seeing that it rains outside or hearing that the baby is crying, one acquires ''a posteriori'' knowledge of these facts.<ref>{{harvnb|Baehr|2022|loc=Lead Section}}</ref> ''A priori'' knowledge is possible without any experience to justify or support the known proposition.<ref>{{multiref | {{harvnb|Russell|2020|loc=Lead Section}} | {{harvnb|Baehr|2022|loc=Lead Section}} }}</ref> Mathematical knowledge, such as that 2 + 2 = 4, belongs to ''a priori'' knowledge since no empirical investigation is necessary to confirm this fact. In this regard, ''a posteriori'' knowledge is empirical knowledge while ''a priori'' knowledge is non-empirical knowledge.<ref>{{harvnb|Moser|2016|loc=Lead Section}}</ref>

The relevant experience in question is primarily identified with [[Experience#Perception|sensory experience]]. Some non-sensory experiences, like memory and introspection, are often included as well. Some conscious phenomena are excluded from the relevant experience, like rational insight into the solution of a mathematical problem.<ref>{{multiref | {{harvnb|Baehr|2022|loc=§ 1. An Initial Characterization, § 4. The Relevant Sense of 'Experience'}} | {{harvnb|Russell|2020|loc=§ 4.1 A Priori Justification Is Justification That Is Independent of Experience}} }}</ref> The same is the case for the experience needed to learn the words through which the claim is expressed. For example, knowing that "all bachelors are unmarried" is ''a priori'' knowledge because no sensory experience is necessary to confirm this fact even though experience was needed to learn the meanings of the words "bachelor" and "unmarried".<ref>{{multiref | {{harvnb|Baehr|2022}} | {{harvnb|Russell|2020|loc=§ 4.1 A Priori Justification Is Justification That Is Independent of Experience}} }}</ref>

One difficulty for ''a priori'' knowledge is to explain how it is possible. It is usually seen as unproblematic that one can come to know things through experience, but it is not clear how knowledge is possible without experience. One of the earliest solutions to this problem is due to Plato, who argues that the soul already possesses the knowledge and just needs to recollect, or remember it, to access it again.<ref>{{multiref | {{harvnb|Woolf|2013|pp=[https://academic.oup.com/mind/article/122/485/171/961176 192–193]}} | {{harvnb|Hirschberger|2019|p=[https://books.google.com/books?id=LWGlDwAAQBAJ&pg=PT22 22]}} }}</ref> A similar explanation is given by Descartes, who holds that ''a priori'' knowledge exists as [[innate knowledge]] present in the [[mind]] of each human.<ref>{{multiref | {{harvnb|Moser|1998|loc=§ 2. Innate concepts, certainty and the a priori}} | {{harvnb|Markie|1998|loc=§ 2. Innate ideas}} }}</ref> A further approach posits a special mental faculty responsible for this type of knowledge, often referred to as [[rational intuition]] or rational insight.<ref>{{harvnb|Baehr|2022|loc=§ 1. An Initial Characterization, § 6. Positive Characterizations of the A Priori}}</ref>

=== Others ===
Various other types of knowledge are discussed in the academic literature. In philosophy, "self-knowledge" refers to a person's knowledge of their own [[Sense|sensations]], [[thought]]s, beliefs, and other mental states. A common view is that self-knowledge is more direct than knowledge of the external world, which relies on the interpretation of sense data. Because of this, it is traditionally claimed that self-knowledge is indubitable, like the claim that a person cannot be wrong about whether they are in pain. However, this position is not universally accepted in the contemporary discourse and an alternative view states that self-knowledge also depends on interpretations that could be false.<ref>{{multiref | {{harvnb|Gertler|2021|loc=Lead Section, § 1. The Distinctiveness of Self-Knowledge}} | {{harvnb|Gertler|2010|p=1}} | {{harvnb|McGeer|2001|pp=13837–13841}} }}</ref> In a slightly different sense, [[Self-knowledge (psychology)|self-knowledge]] can also refer to knowledge of the [[self]] as a persisting entity with certain [[personality traits]], [[preference]]s, physical attributes, relationships, goals, and [[Identity (social science)|social identities]].<ref>{{multiref | {{harvnb|Gertler|2021a}} | {{harvnb|Morin|Racy|2021|pp=373–374}} | {{harvnb|Kernis|2013|p=[https://books.google.com/books?id=r0gahbOYsU4C&pg=PA209 209]}} }}</ref>{{efn|Individuals may lack a deeper understanding of their character and feelings and attaining self-knowledge is one step in the [[psychoanalysis]].<ref>{{multiref | {{harvnb|Wilson|2002|pp=3–4}} | {{harvnb|Reginster|2017|pp=[https://books.google.com/books?id=Pr5LDQAAQBAJ&pg=PA231 231–232]}} }}</ref>}}

[[Metaknowledge]] is knowledge about knowledge. It can arise in the form of self-knowledge but includes other types as well, such as knowing what someone else knows or what information is contained in a scientific article. Other aspects of metaknowledge include knowing how knowledge can be acquired, stored, distributed, and used.<ref>{{multiref | {{harvnb|Evans|Foster|2011|pp=721–725}} | {{harvnb|Rescher|2005|p=[https://books.google.com/books?id=o7m3amAbDEsC&pg=PA20 20]}} | {{harvnb|Cox|Raja|2011|p=[https://books.google.com/books?id=OR4Ld8NeFE8C&pg=PA134 134]}} | {{harvnb|Leondes|2001|p=[https://books.google.com/books?id=5kSamKhS560C&pg=PA416 416]}} }}</ref>

[[Common knowledge]] is knowledge that is publicly known and shared by most individuals within a community. It establishes a common ground for communication, understanding, social cohesion, and cooperation.<ref>{{multiref | {{harvnb|Desouza|Awazu|2005|p=[https://books.google.com/books?id=GRyBDAAAQBAJ&pg=PA53 53]}} | {{harvnb|Jorna|2017|p=[https://books.google.com/books?id=KKo0DwAAQBAJ&pg=PT340 340]}} | {{harvnb|Faber|Maruster|Jorna|2017|p=[https://books.google.com/books?id=KKo0DwAAQBAJ&pg=PT340 340]}} }}</ref> [[General knowledge]] encompasses common knowledge but also includes knowledge that many people have been exposed to but may not be able to immediately recall.<ref>{{harvnb|Schneider|McGrew|2022|pp=[https://books.google.com/books?id=bqKgEAAAQBAJ&pg=PA115 115–116]}}</ref> Common knowledge contrasts with [[domain knowledge]] or specialized knowledge, which belongs to a specific domain and is only possessed by experts.<ref>{{multiref | {{harvnb|Faber|Maruster|Jorna|2017|p=[https://books.google.com/books?id=KKo0DwAAQBAJ&pg=PT340 340]}} | {{harvnb|Vempala|2014|loc=[https://books.google.com/books?id=qfcOBAAAQBAJ&pg=PA277 Creativity, Theories of Musical]}} }}</ref>

{{Anchor|Situated knowledge}}
'''Situated knowledge''' is knowledge specific to a particular situation.<ref name="auto4">{{multiref | {{harvnb|APA staff|2022}} | {{harvnb|Hunter|2009|pp=[https://link.springer.com/chapter/10.1057/9780230244481_23 151–153]}} }}</ref> It is closely related to practical or tacit knowledge, which is learned and applied in specific circumstances. This especially concerns certain forms of acquiring knowledge, such as [[trial and error]] or learning from experience.<ref>{{harvnb|Barnett|2006|pp=[https://books.google.com/books?id=WX9UVK6FYSkC&pg=PA146 146–147]}}</ref> In this regard, situated knowledge usually lacks a more explicit structure and is not articulated in terms of universal ideas.<ref>{{harvnb|Hunter|2009|pp=[https://link.springer.com/chapter/10.1057/9780230244481_23 151–153]}}</ref> The term is often used in [[feminism]] and [[postmodernism]] to argue that many forms of knowledge are not absolute but depend on the concrete historical, cultural, and linguistic context.<ref name="auto4"/>

[[Explicit knowledge]] is knowledge that can be fully articulated, shared, and explained, like the knowledge of historical dates and mathematical formulas. It can be acquired through traditional learning methods, such as reading books and attending lectures. It contrasts with [[tacit knowledge]], which is not easily articulated or explained to others, like the ability to recognize someone's face and the practical expertise of a master craftsman. Tacit knowledge is often learned through first-hand experience or direct practice.<ref>{{multiref | {{harvnb|Gascoigne|Thornton|2014|pp=[https://books.google.com/books?id=IVlsBAAAQBAJ&pg=PA8 8, 37, 81, 108]}} | {{harvnb|Hill|2009|loc=[https://www.encyclopedia.com/management/encyclopedias-almanacs-transcripts-and-maps/knowledge-based-view-firm § Idiosyncratic Views of Knowledge]}} | {{harvnb|Wilson|Cattell|2005|p=[https://books.google.com/books?id=zpNc_GZIiikC&pg=PA118 118]}} }}</ref> In some cases, it is possible to convert tacit knowledge and explicit knowledge into one another.<ref>{{multiref | {{harvnb|Becerra-Fernandez|2010|p=[https://books.google.com/books?id=4QHLU-ELWsMC&pg=PA263 263]}} | {{harvnb|Wilson|Cattell|2005|p=[https://books.google.com/books?id=zpNc_GZIiikC&pg=PA119 119]}} }}</ref>

Knowledge can be [[Belief#Occurrent and dispositional|occurrent or dispositional]]. Occurrent knowledge is knowledge that is actively involved in cognitive processes. Dispositional knowledge, by contrast, lies dormant in the back of a person's mind and is given by the mere ability to access the relevant information. For example, if a person knows that cats have [[whiskers]] then this knowledge is dispositional most of the time and becomes occurrent while they are thinking about it.<ref>{{multiref | {{harvnb|Stroll|2023|loc=§ Occasional and Dispositional Knowledge}} | {{harvnb|Bartlett|2018|pp=[https://philpapers.org/rec/BAROS-4 1–2]}} | {{harvnb|Schwitzgebel|2021}} }}</ref>

Many forms of Eastern spirituality and religion distinguish between higher and lower knowledge. They are also referred to as [[Para Vidya|para vidya]] and [[Vidya (philosophy)#Hierarchy of knowledge|apara vidya]] in [[Hinduism]] or the [[two truths doctrine]] in [[Buddhism]]. Lower knowledge is based on the senses and the intellect. It encompasses both mundane or conventional truths as well as discoveries of the empirical sciences.<ref>{{multiref | {{harvnb|The Hindu staff|2018}} | {{harvnb|Thakchoe|2022|loc=Lead Section}} | {{harvnb|Mishra|2021|p=[https://books.google.com/books?id=v8s7EAAAQBAJ&pg=PA52 52]}} | {{harvnb|Ghose|1998|loc=[https://incarnateword.in/cwsa/7/the-glory-of-god-in-man Political Writings and Speeches. 1890–1908: The Glory of God in Man]}} }}</ref> Higher knowledge is understood as knowledge of God, [[Absolute (philosophy)|the absolute]], the [[true self]], or the [[ultimate reality]]. It belongs neither to the external world of physical objects nor to the internal world of the experience of emotions and concepts. Many spiritual teachings stress the importance of higher knowledge to progress on the spiritual path and to see reality as it truly is beyond the [[Maya (religion)|veil of appearances]].<ref>{{multiref | {{harvnb|The Hindu staff|2018}} | {{harvnb|Mishra|2021|p=[https://books.google.com/books?id=v8s7EAAAQBAJ&pg=PA52 52]}} | {{harvnb|Ghose|1998|loc=[https://incarnateword.in/cwsa/7/the-glory-of-god-in-man Political Writings and Speeches. 1890–1908: The Glory of God in Man]}} }}</ref>

== Sources ==
[[File:Five Senses.jpg|thumb|alt=Photos of the five senses|Perception relies on the [[senses]] to acquire knowledge.]]

Sources of knowledge are ways in which people come to know things. They can be understood as cognitive capacities that are exercised when a person acquires new knowledge.<ref>{{multiref | {{harvnb|Kern|2017|pp=[https://books.google.com/books?id=eyh5DQAAQBAJ&pg=PA8 8–10, 133]}} | {{harvnb|Spaulding|2016|pp=[https://books.google.com/books?id=4ct5CwAAQBAJ&pg=PA223 223–224]}} }}</ref> Various sources of knowledge are discussed in the academic literature, often in terms of the mental faculties responsible. They include perception, introspection, memory, inference, and testimony. However, not everyone agrees that all of them actually lead to knowledge. Usually, [[perception]] or observation, i.e. using one of the [[senses]], is identified as the most important source of empirical knowledge.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 3. Ways of Knowing}} | {{harvnb|Stroll|2023|loc=§ The Origins of Knowledge}} | {{harvnb|O'Brien|2022|loc=Lead Section}} }}</ref> Knowing that a baby is sleeping is observational knowledge if it was caused by a perception of the snoring baby. However, this would not be the case if one learned about this fact through a telephone conversation with one's spouse. [[Direct realism|Direct realists]] explain observational knowledge by holding that perception is a direct contact with the perceived object. [[Indirect realism|Indirect realists]] contend that this contact happens indirectly: people can only directly perceive [[sense data]], which are then interpreted as representing external objects. This contrast affects whether the knowledge of external objects is direct or indirect and may thus have an impact on how certain perceptual knowledge is.<ref>{{harvnb|Steup|Neta|2020|loc=§ 5.1 Perception}}</ref>

[[Introspection]] is often seen in analogy to perception as a source of knowledge, not of external physical objects, but of internal [[mental states]]. A traditionally common view is that introspection has a special epistemic status by being infallible. According to this position, it is not possible to be mistaken about introspective facts, like whether one is in pain, because there is no difference between appearance and reality. However, this claim has been contested in the contemporary discourse and critics argue that it may be possible, for example, to mistake an unpleasant itch for a pain or to confuse the experience of a slight ellipse for the experience of a circle.<ref>{{harvnb|Steup|Neta|2020|loc=§ 5.2 Introspection}}</ref> Perceptual and introspective knowledge often act as a form of fundamental or basic knowledge. According to some [[Empiricism|empiricists]], they are the only sources of basic knowledge and provide the foundation for all other knowledge.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 3. Ways of Knowing}} | {{harvnb|Stroll|2023|loc=§ The Origins of Knowledge}} }}</ref>

Memory differs from perception and introspection in that it is not as independent or basic as they are since it depends on other previous experiences.<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=§ 5.3 Memory}} | {{harvnb|Audi|2002|pp=[https://philpapers.org/rec/AUDTSO-3 72–75]}} }}</ref> The faculty of memory retains knowledge acquired in the past and makes it accessible in the present, as when remembering a past event or a friend's phone number.<ref>{{multiref | {{harvnb|Gardiner|2001|pp=1351–1352}} | {{harvnb|Michaelian|Sutton|2017}} }}</ref> It is generally seen as a reliable source of knowledge. However, it can be deceptive at times nonetheless, either because the original experience was unreliable or because the memory degraded and does not accurately represent the original experience anymore.<ref>{{harvnb|Steup|Neta|2020|loc=§ 5.3 Memory}}</ref>{{efn|[[Confabulation]] is a special type of [[memory error]] that consists remembering events that did not happen, often provoked by an attempt to fill memory gaps.<ref>{{multiref | {{harvnb|Baird|Maskill|2017|p=[https://books.google.com/books?id=6WbgDQAAQBAJ&pg=PA140 140]}} | {{harvnb|AHD Staff|2022e}} }}</ref>}}

Knowledge based on perception, introspection, and memory may give rise to inferential knowledge, which comes about when reasoning is applied to draw inferences from other known facts.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 3d. Knowing by Thinking-Plus-Observing}} | {{harvnb|Steup|Neta|2020|loc=§ 5.4 Reason}} }}</ref> For example, the perceptual knowledge of a Czech stamp on a postcard may give rise to the inferential knowledge that one's friend is visiting the Czech Republic. This type of knowledge depends on other sources of knowledge responsible for the premises. [[Rationalism|Rationalists]] argue that some forms of knowledge arise from reason alone completely independent of observation and introspection. They use this approach to explain how a priori beliefs, like the mathematical belief that 2 + 2 = 4, constitute knowledge. One explanation of knowledge by pure reason holds that there is a mental faculty of rational intuition. This faculty can be used to explain why such general and abstract beliefs amount to knowledge even though there seem to be no sensory perceptions that could justify them.<ref>{{multiref | {{harvnb|Audi|2002|pp=[https://philpapers.org/rec/AUDTSO-3 85, 90–91]}} | {{harvnb|Markie|Folescu|2021|loc=Lead Section, § 1. Introduction}} }}</ref> However, difficulties in providing a clear account of pure reason or rational intuition have led some empirically-minded epistemologists to doubt that they constitute independent sources of knowledge.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 3c. Knowing Purely by Thinking}} | {{harvnb|Stroll|2023|loc=§ Rationalism and Empiricism}} | {{harvnb|Steup|Neta|2020|loc=§ 5.4 Reason}} }}</ref> A closely related approach holds that this type of knowledge is innate. According to Plato's theory of recollection, for example, it is accessed through a [[Anamnesis (philosophy)|special form of remembering]].<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 3a. Innate Knowledge}} | {{harvnb|Stroll|2023|loc=§ Innate and Acquired Knowledge}} }}</ref>

[[File:Borochov-testimony.jpg|thumb|alt=Photograph of a person giving testimony|Knowledge by testimony relies on statements given by other people, like the testimony given at a trial.]]
[[Testimony]] is often included as an additional source of knowledge that, unlike the other sources, is not tied to one specific cognitive faculty. Instead, it is based on the idea that one person can come to know a fact because another person talks about this fact. Testimony can happen in numerous ways, like regular speech, a letter, a newspaper, or an online blog. The [[Philosophy of testimony|problem of testimony]] consists in clarifying why and under what circumstances testimony can lead to knowledge. A common response is that it depends on the reliability of the person pronouncing the testimony: only testimony from reliable sources can lead to knowledge.<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=§ 5.5 Testimony}} | {{harvnb|Leonard|2021|loc=Lead Section, § 1. Reductionism and Non-Reductionism}} | {{harvnb|Green|2022|loc=Lead Section}} }}</ref>

== Limits ==
The problem of the limits of knowledge concerns the question of which facts are [[Unknowability|unknowable]].<ref>{{multiref | {{harvnb|Rescher|2009|pp=ix, 1–2}} | {{harvnb|Rescher|2005a|p=479}} | {{harvnb|Markie|Folescu|2023|loc=§ 1. Introduction}} }}</ref> These limits constitute a form of inevitable [[ignorance]] that can affect both what is knowable about the external world as well as what one can know about oneself and about what is good.<ref>{{multiref | {{harvnb|Markie|Folescu|2023|loc=§ 1. Introduction}} | {{harvnb|Rescher|2009|p=2, 6}} | {{harvnb|Stoltz|2021|p=[https://books.google.com/books?id=pTkqEAAAQBAJ&pg=PA120 120]}} }}</ref> Some limits of knowledge only apply to particular people in specific situations while others pertain to humanity at large.<ref>{{harvnb|Rescher|2009|p=6}}</ref> A fact is unknowable to a person if this person lacks access to the relevant information, like facts in the past that did not leave any significant traces. For example, it may be unknowable to people today what [[Caesar]]'s breakfast was the [[Ides of March|day he was assassinated]] but it was knowable to him and some contemporaries.<ref>{{multiref | {{harvnb|Rescher|2009|pp=2, 6}} | {{harvnb|Rescher|2009a|pp=140–141}} }}</ref> Another factor restricting knowledge is given by the limitations of the human [[Cognition|cognitive]] faculties. Some people may lack the cognitive ability to understand highly abstract mathematical truths and some facts cannot be known by any human because they are too complex for the human mind to conceive.<ref>{{multiref | {{harvnb|Rescher|2009|pp=10, 93}} | {{harvnb|Rescher|2009a|pp=x–xi, 57–58}} | {{harvnb|Dika|2023|p=163}} }}</ref> A further limit of knowledge arises due to certain logical [[paradox]]es. For instance, there are some ideas that will never occur to anyone. It is not possible to know them because if a person knew about such an idea then this idea would have occurred at least to them.<ref>{{multiref | {{harvnb|Rescher|2009|pp=3, 9, 65–66}} | {{harvnb|Rescher|2009a|pp=32–33}} | {{harvnb|Weisberg|2021|loc=§ 4. Fourth Case Study: The Limits of Knowledge}} }}</ref>{{efn|An offen-cited paradox from the field of formal epistemology is [[Fitch's paradox of knowability]], which states that knowledge has limits because denying this claim leads to the absurd conclusion that every truth is known.<ref>{{harvnb|Weisberg|2021|loc=§ 4.2 The Knowability Paradox (a.k.a. the Church-Fitch Paradox)}}</ref>}}

There are many disputes about what can or cannot be known in certain fields. [[Religious skepticism]] is the view that beliefs about God or other religious doctrines do not amount to knowledge.<ref>{{harvnb|Kreeft|Tacelli|2009|p=[https://books.google.com/books?id=1DH1ZPyyTkIC&pg=PA371 371]}}</ref> [[Moral skepticism]] encompasses a variety of views, including the claim that [[Ethics#Moral knowledge|moral knowledge]] is impossible, meaning that one cannot know what is morally good or whether a certain behavior is morally right.<ref>{{multiref | {{harvnb|Sinnott-Armstrong|2019|loc=Lead Section, § 1. Varieties of Moral Skepticism, § 2. A Presumption Against Moral Skepticism?}} | {{harvnb|Sayre-McCord|2023|loc=§ 5. Moral Epistemology}} }}</ref> An influential theory about the limits of [[metaphysical]] knowledge was proposed by [[Immanuel Kant]]. For him, knowledge is restricted to the field of [[Phenomenon|appearances]] and does not reach the [[Thing in itself|things in themselves]], which exist independently of humans and lie beyond the realm of appearances. Based on the observation that metaphysics aims to characterize the things in themselves, he concludes that no metaphysical knowledge is possible, like knowing whether [[Kant's antinomies#The first antinomy (of space and time)|the world has a beginning or is infinite]].<ref>{{multiref | {{harvnb|McCormick|loc=§ 4. Kant's Transcendental Idealism}} | {{harvnb|Williams|2023|loc=Lead Section, § 1. Theoretical reason: reason’s cognitive role and limitations}} | {{harvnb|Blackburn|2008|p=101}} }}</ref>

There are also limits to knowledge in the empirical sciences, such as the [[uncertainty principle]], which states that it is impossible to know the exact magnitudes of certain certain pairs of physical properties, like the position and [[momentum]] of a particle, at the same time.<ref>{{multiref | {{harvnb|Rutten|2012|p=[https://books.google.com/books?id=8sHJD2fXDg4C&pg=PA189 189]}} | {{harvnb|Yanofsky|2013|p=185–186}} }}</ref> Other examples are physical systems studied by [[chaos theory]], for which it is not practically possible to predict how they will behave since they are so sensitive to [[initial conditions]] that even the slightest of variations may produce a completely different behavior. This phenomenon is known as the [[butterfly effect]].<ref>{{harvnb|Yanofsky|2013|p=161–164}}</ref>

[[File:Philosopher,_marble_head,_Roman_copy,_AM_Corfu,_Krfm22.jpg|thumb|upright=.8|alt=Bust of Pyrrho of Elis|[[Pyrrho]] was one of the first philosophical skeptics.]]

The strongest position about the limits of knowledge is [[radical skepticism|radical or global skepticism]], which holds that humans lack any form of knowledge or that knowledge is impossible. For example, the [[dream argument]] states that perceptual experience is not a source of knowledge since dreaming provides unreliable information and a person could be dreaming without knowing it. Because of this inability to discriminate between dream and perception, it is argued that there is no perceptual knowledge of the external world.<ref>{{multiref | {{harvnb|Windt|2021|loc=§ 1.1 Cartesian Dream Skepticism}} | {{harvnb|Klein|1998|loc=§ 8. The Epistemic Principles and Scepticism}} | {{harvnb|Hetherington|2022a|loc=§ 4. Sceptical Doubts About Knowing}} }}</ref>{{efn|A similar often-cited [[thought experiment]] assumes that a person is not a regular human being but a [[brain in a vat]] that receives electrical stimuli. These stimuli give the brain the false impression of having a body and interacting with the external world. Since the person is unable to tell the difference, it is argued that they do not know that they have a body responsible for reliable perceptions.<ref name="auto3">{{harvnb|Steup|Neta|2020|loc=§ 6.1 General Skepticism and Selective Skepticism}}</ref>}} This thought experiment is based on the problem of [[underdetermination]], which arises when the available evidence is not sufficient to make a rational decision between competing theories. In such cases, a person is not justified in believing one theory rather than the other. If this is always the case then global skepticism follows.<ref name="auto3"/> Another skeptical argument assumes that knowledge requires absolute certainty and aims to show that all human cognition is fallible since it fails to meet this standard.<ref>{{multiref | {{harvnb|Hetherington|2022a|loc=§ 6. Standards for Knowing}} | {{harvnb|Klein|1998|loc=§ 8. The Epistemic Principles and Scepticism}} | {{harvnb|Steup|Neta|2020|loc=§ 6.1 General Skepticism and Selective Skepticism}} }}</ref>

An influential argument against radical skepticism states that radical skepticism is [[Self-refuting idea|self-contradictory]] since denying the existence of knowledge is itself a knowledge-claim.<ref>{{harvnb|Stroll|2023|loc=§ Skepticism}}</ref> Other arguments rely on [[common sense]]<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=§ 6.2 Responses to the Closure Argument}} | {{harvnb|Lycan|2019|pp=[https://books.google.com/books?id=cfeEDwAAQBAJ&pg=PT21 21–22, 5–36]}} }}</ref> or deny that infallibility is required for knowledge.<ref>{{multiref | {{harvnb|McDermid|2023}} | {{harvnb|Misak|2002|p=[https://books.google.com/books?id=S6WHAgAAQBAJ&pg=PA53 53]}} | {{harvnb|Hamner|2003|p=[https://books.google.com/books?id=Uno8DwAAQBAJ&pg=PA87 87]}} }}</ref> Very few philosophers have explicitly defended radical skepticism but this position has been influential nonetheless, usually in a negative sense: many see it as a serious challenge to any epistemological theory and often try to show how their preferred theory overcomes it.<ref>{{multiref | {{harvnb|Klein|1998|loc=§ 8. The Epistemic Principles and Scepticism}} | {{harvnb|Hetherington|2022a|loc=§ 4. Sceptical Doubts About Knowing}} | {{harvnb|Steup|Neta|2020|loc=§ 6.1 General Skepticism and Selective Skepticism}} }}</ref> A weaker form of [[philosophical skepticism]] advocates the [[Epoche|suspension of judgment]] as a form of attaining [[Ataraxia|tranquility]] while remaining [[humility|humble]] and [[open-minded]].<ref>{{multiref | {{harvnb|Attie-Picker|2020|pp=97–98}} | {{harvnb|Perin|2020|pp=[https://www.taylorfrancis.com/chapters/edit/10.4324/9781351168120-23/tranquility-goal-pyrrhonian-skepticism-casey-perin 285–286]}} }}</ref>

== Structure ==
The structure of knowledge is the way in which the mental states of a person need to be related to each other for knowledge to arise.<ref>{{multiref | {{harvnb|Hasan|Fumerton|2018|loc=Lead Section, 2. The Classical Analysis of Foundational Justification}} | {{harvnb|Fumerton|2022|loc=§ Summary}} }}</ref> A common view is that a person has to have good reasons for holding a belief if this belief is to amount to knowledge. When the belief is challenged, the person may justify it by referring to their reason for holding it. In many cases, this reason depends itself on another belief that may as well be challenged. An example is a person who believes that Ford cars are cheaper than BMWs. When their belief is challenged, they may justify it by claiming that they heard it from a reliable source. This justification depends on the assumption that their source is reliable, which may itself be challenged. The same may apply to any subsequent reason they cite.<ref name="auto2">{{multiref | {{harvnb|Klein|1998|loc=Lead Section, § 4. Foundationalism and Coherentism}} | {{harvnb|Steup|Neta|2020|loc=§ 4. The Structure of Knowledge and Justification}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} }}</ref> This threatens to lead to an [[infinite regress]] since the epistemic status at each step depends on the epistemic status of the previous step.<ref>{{multiref | {{harvnb|Cameron|2018}} | {{harvnb|Clark|1988|pp=[https://philpapers.org/rec/CLAVIR 369–370]}} }}</ref> Theories of the structure of knowledge offer responses for how to solve this problem.<ref name="auto2"/>

[[File:Foundationalism, coherentism, infinitism.svg|thumb|upright=1.5|alt=Diagram showing the differences between foundationalism, coherentism, and infinitism|Foundationalism, coherentism, and infinitism are theories of the structure of knowledge. The black arrows symbolize how one belief supports another belief.]]
The three most common theories are [[foundationalism]], [[coherentism]], and [[infinitism]]. Foundationalists and coherentists deny the existence of an infinite regress, in contrast to infinitists.<ref name="auto2"/> According to foundationalists, some basic reasons have their epistemic status independent of other reasons and thereby constitute the endpoint of the regress.<ref>{{multiref | {{harvnb|Klein|1998|loc=Lead Section, § 4. Foundationalism and Coherentism}} | {{harvnb|Steup|Neta|2020|loc=§ 4.1 Foundationalism}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} }}</ref> Some foundationalists hold that certain sources of knowledge, like perception, provide basic reasons. Another view is that this role is played by certain self-evident truths, like the [[Cogito ergo sum|knowledge of one's own existence]] and the content of one's ideas.<ref>{{multiref | {{harvnb|Poston|loc=[https://iep.utm.edu/foundationalism-in-epistemology/ Lead Section]}} | {{harvnb|Hasan|Fumerton|2022|loc=[https://plato.stanford.edu/entries/justep-foundational/ § 1. Regress Arguments for Foundationalism]}} }}</ref> The view that basic reasons exist is not universally accepted. One criticism states that there should be a reason why some reasons are basic while others are not. According to this view, the putative basic reasons are not actually basic since their status would depend on other reasons. Another criticism is based on [[hermeneutics]] and argues that all [[Hermeneutic circle|understanding is circular]] and requires interpretation, which implies that there is no secure foundation. Epistemologists who agree about the existence of basic reasons may disagree about which reasons constitute basic reasons.<ref>{{multiref | {{harvnb|Klein|1998|loc=§ 4. Foundationalism and Coherentism}} | {{harvnb|Steup|Neta|2020|loc=§ 4. The Structure of Knowledge and Justification}} | {{harvnb|Lehrer|2015|loc=[https://books.google.com/books?id=yKG9CgAAQBAJ&pg=PA1 1. The Analysis of Knowledge]}} | {{harvnb|George|2021|loc=§ 1.2 Against Foundationalism, § 1.3 The Hermeneutical Circle}} }}</ref>

Coherentists and infinitists avoid these problems by denying the contrast between basic and non-basic reasons. Coherentists argue that there is only a finite number of reasons, which mutually support and justify one another. This is based on the intuition that beliefs do not exist in isolation but form a complex web of interconnected ideas that is justified by its coherence rather than by a few privileged foundational beliefs.<ref name="auto">{{multiref | {{harvnb|Klein|1998|loc=§ 4. Foundationalism and Coherentism}} | {{harvnb|Steup|Neta|2020|loc=§ 4. The Structure of Knowledge and Justification}} }}</ref> One difficulty for this view is how to demonstrate that it does not involve the fallacy of [[circular reasoning]].<ref>{{multiref | {{harvnb|Murphy|2022}} | {{harvnb|Lammenranta|2022}} }}</ref> If two beliefs mutually support each other then a person has a reason for accepting one belief if they already have the other. However, mutual support alone is not a good reason for newly accepting both beliefs at once. A closely related issue is that there can be distinct sets of coherent beliefs. Coherentists face the problem of explaining why someone should accept one coherent set rather than another.<ref name="auto"/> For infinitists, in contrast to foundationalists and coherentists, there is an infinite number of reasons. This view embraces the idea that there is a regress since each reason depends on another reason. One difficulty for this view is that the human mind is limited and may not be able to possess an infinite number of reasons. This raises the question of whether, according to infinitism, human knowledge is possible at all.<ref>{{harvnb|Klein|1998|loc=§ 4. Foundationalism and Coherentism}}</ref>

== Value ==
[[File:File-Los portadores de la antorcha.jpg|thumb|alt=Sculpture showing a torch being passed form one person to another|upright=.9|''Los portadores de la antorcha (The Torch-Bearers)'' – sculpture by [[Anna Hyatt Huntington]] symbolizing the transmission of knowledge from one generation to the next ([[Complutense University of Madrid|Ciudad Universitaria, Madrid, Spain]])]]
Knowledge may be valuable either because it is useful or because it is good in itself. Knowledge can be useful by helping a person achieve their goals. For example, if one knows the answers to questions in an exam one is able to pass that exam or by knowing which horse is the fastest, one can earn money from bets. In these cases, knowledge has [[instrumental value]].<ref>{{multiref | {{harvnb|Degenhardt|2019|pp=[https://books.google.com/books?id=FuCsDwAAQBAJ&pg=PA1 1–6]}} | {{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 2 The value of knowledge]}} | {{harvnb|Olsson|2011|pp=874–875}} }}</ref> Not all forms of knowledge are useful and many beliefs about trivial matters have no instrumental value. This concerns, for example, knowing how many grains of sand are on a specific beach or memorizing phone numbers one never intends to call. In a few cases, knowledge may even have a negative value. For example, if a person's life depends on gathering the courage to jump over a ravine, then having a true belief about the involved dangers may hinder them from doing so.<ref>{{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 2 The value of knowledge]}}</ref>

[[File:Early Childhood Education USAID Africa.jpg|thumb|alt=Photo of early childhood education in Ziway, Ethiopia|The value of knowledge plays a key role in education for deciding which knowledge to pass on to the students.]]
Besides having instrumental value, knowledge may also have [[Axiology#Intrinsic value|intrinsic value]]. This means that some forms of knowledge are good in themselves even if they do not provide any practical benefits. According to Duncan Pritchard, this applies to forms of knowledge linked to [[wisdom]].<ref>{{multiref | {{harvnb|Pritchard|2013|loc=[https://books.google.com/books?id=sfUhAQAAQBAJ 2 The value of knowledge]}} | {{harvnb|Degenhardt|2019|pp=[https://books.google.com/books?id=FuCsDwAAQBAJ&pg=PA1 1–6]}} }}</ref> The value of knowledge is relevant to the field of education, specifically to the issue of choosing which knowledge should be passed on to the student.<ref>{{harvnb|Degenhardt|2019|pp=[https://books.google.com/books?id=FuCsDwAAQBAJ&pg=PA1 1–6]}}</ref>

A more specific issue in epistemology concerns the question of whether or why knowledge is more valuable than mere true belief.<ref>{{multiref | {{harvnb|Pritchard|Turri|Carter|2022}} | {{harvnb|Olsson|2011|pp=874–875}} }}</ref> There is wide agreement that knowledge is usually good in some sense but the thesis that knowledge is better than true belief is controversial. An early discussion of this problem is found in Plato's [[Meno]] in relation to the claim that both knowledge and true belief can successfully guide [[Action (philosophy)|action]] and, therefore, have apparently the same value. For example, it seems that mere true belief is as effective as knowledge when trying to find the way to [[Larissa]].<ref>{{multiref | {{harvnb|Olsson|2011|pp=874–875}} | {{harvnb|Pritchard|Turri|Carter|2022}} | {{harvnb|Plato|2002|pp=[https://archive.org/details/fivedialogueseut00plat/page/89 89–90, 97b–98a]}} }}</ref> According to Plato, knowledge is better because it is more stable.<ref>{{harvnb|Olsson|2011|p=875}}</ref> Another suggestion is that knowledge gets its additional value from justification. One difficulty for this view is that while justification makes it more probable that a belief is true, it is not clear what additional value it provides in comparison to an unjustified belief that is already true.<ref>{{harvnb|Pritchard|Turri|Carter|2022|loc=Lead Section, § 6. Other Accounts of the Value of Knowledge}}</ref>

The problem of the value of knowledge is often discussed in relation to [[reliabilism]] and [[virtue epistemology]].<ref>{{multiref | {{harvnb|Pritchard|Turri|Carter|2022}} | {{harvnb|Olsson|2011|p=874}} | {{harvnb|Pritchard|2007|pp=85–86}} }}</ref> Reliabilism can be defined as the thesis that knowledge is reliably formed true belief. This view has difficulties in explaining why knowledge is valuable or how a reliable belief-forming process adds additional value.<ref>{{harvnb|Pritchard|Turri|Carter|2022|loc=§ 2. Reliabilism and the Meno Problem, § 3. Virtue Epistemology and the Value Problem}}</ref> According to an analogy by philosopher [[Linda Zagzebski]], a cup of coffee made by a reliable coffee machine has the same value as an equally good cup of coffee made by an unreliable coffee machine.<ref>{{harvnb|Turri|Alfano|Greco|2021}}</ref> This difficulty in solving the value problem is sometimes used as an argument against reliabilism.<ref>{{harvnb|Pritchard|Turri|Carter|2022|loc=§ 2. Reliabilism and the Meno Problem}}</ref> Virtue epistemology, by contrast, offers a unique solution to the value problem. Virtue epistemologists see knowledge as the manifestation of cognitive virtues. They argue that knowledge has additional value due to its association with virtue. This is based on the idea that cognitive success in the form of the manifestation of virtues is inherently valuable independent of whether the resulting states are instrumentally useful.<ref>{{multiref | {{harvnb|Pritchard|Turri|Carter|2022|loc=§ 3. Virtue Epistemology and the Value Problem}} | {{harvnb|Olsson|2011|p=877}} | {{harvnb|Turri|Alfano|Greco|2021|loc=[https://plato.stanford.edu/entries/epistemology-virtue/#EpisValu § 6. Epistemic Value]}} }}</ref>

== Science ==
{{main|Philosophy of science}}
The scientific approach is usually regarded as an exemplary process of how to gain knowledge about empirical facts.<ref name="auto5">{{multiref | {{harvnb|Pritchard|2013|pp=[https://books.google.com/books?id=sfUhAQAAQBAJ 115–118]|loc=11 Scientific Knowledge}} | {{harvnb|Moser|2005|p=385}} }}</ref> Scientific knowledge includes mundane knowledge about easily observable facts, for example, [[chemical]] knowledge that certain reactants become hot when mixed together. It also encompasses knowledge of less tangible issues, like claims about the behavior of [[gene]]s, [[neutrino]]s, and [[black hole]]s.<ref>{{harvnb|Moser|2005|p=386}}</ref>

A key aspect of most forms of science is that they seek natural laws that explain empirical observations.<ref name="auto5"/> Scientific knowledge is discovered and tested using the [[scientific method]]. This method aims to arrive at reliable knowledge by formulating the problem in a clear way and by ensuring that the evidence used to support or refute a specific theory is public, reliable, and replicable. This way, other researchers can repeat the experiments and observations in the initial study to confirm or disconfirm it.<ref>{{multiref |1={{harvnb|Moser|2005|p=390}} |2={{harvnb|Hatfield|1996|loc=[https://philpapers.org/rec/BEAREO Scientific method]}} |3={{harvnb|Beins|2017|pp=[https://books.google.com/books?id=fBs0DwAAQBAJ&pg=PA8 8–9]}} |4={{harvnb|Hepburn|Andersen|2021}} }}</ref> The scientific method is often analyzed as a series of steps that begins with regular observation and data collection. Based on these insights, scientists then try to find a [[hypothesis]] that explains the observations. The hypothesis is then tested using a controlled experiment to compare whether predictions based on the hypothesis match the observed results. As a last step, the results are interpreted and a conclusion is reached whether and to what degree the findings confirm or disconfirm the hypothesis.<ref>{{multiref | {{harvnb|Dodd|Zambetti|Deneve|2023|pp=[https://books.google.com/books?id=jXqAEAAAQBAJ&pg=PA11 11–12]}} | {{harvnb|Hatfield|1996|loc=[https://philpapers.org/rec/BEAREO Scientific method]}} | {{harvnb|Hepburn|Andersen|2021}} }}</ref>

The empirical sciences are usually divided into [[Natural science|natural]] and [[social science]]s. The natural sciences, like [[physics]], [[biology]], and [[chemistry]], focus on [[quantitative research]] methods to arrive at knowledge about natural phenomena.<ref>{{multiref | {{harvnb|Cohen|2013|p=[https://books.google.com/books?id=hA7oCAAAQBAJ&pg=PR25 xxv]}} | {{harvnb|Myers|2009|p=[https://books.google.com/books?id=lpEVEfnbx9cC&pg=PA8 8]}} | {{harvnb|Repko|2008|p=[https://books.google.com/books?id=kDoYPVJONIoC&pg=PA200 200]}} }}</ref> Quantitative research happens by making precise numerical [[measurements]] and the natural sciences often rely on advanced technological [[Instrumentation|instruments]] to perform these measurements and to setup experiments. Another common feature of their approach is to use mathematical tools to [[Data analysis|analyze the measured data]] and formulate [[Scientific law|exact and general laws]] to describe the observed phenomena.<ref>{{multiref | {{harvnb|Repko|2008|p=[https://books.google.com/books?id=kDoYPVJONIoC&pg=PA200 200]}} | {{harvnb|Hatfield|1998|loc=§ 3. Scientific Method in Scientific Practice}} | {{harvnb|Mertler|2021|pp=[https://books.google.com/books?id=-kMTEAAAQBAJ&pg=PT100 100–101]}} | {{harvnb|Myers|2009|p=[https://books.google.com/books?id=lpEVEfnbx9cC&pg=PA8 8]}} }}</ref>

The social sciences, like [[sociology]], [[anthropology]], and [[communication studies]], examine social phenomena on the level of human behavior, relationships, and society at large.<ref>{{multiref | {{harvnb|Colander|2016|pp=[https://books.google.com/books?id=JCMlDwAAQBAJ&pg=PA1 1–2]}} | {{harvnb|AHD Staff|2022d}} }}</ref> While they also make use of quantitative research, they usually give more emphasis to [[Qualitative research|qualitative methods]]. Qualitative research gathers non-numerical data, often with the goal of arriving at a deeper understanding of the meaning and interpretation of social phenomena from the perspective of those involved.<ref>{{multiref | {{harvnb|Mertler|2021|pp=[https://books.google.com/books?id=-kMTEAAAQBAJ&pg=PT88 88–89]}} | {{harvnb|Travers|2001|pp=[https://books.google.com/books?id=fEfmzvSg69oC&pg=PA1 1–2]}} }}</ref> This approach can take various forms, such as [[Interview (research)|interviews]], [[focus groups]], and [[case studies]].<ref>{{multiref | {{harvnb|Howell|2013|pp=193–194}} | {{harvnb|Travers|2001|pp=[https://books.google.com/books?id=fEfmzvSg69oC&pg=PA1 1–2]}} | {{harvnb|Klenke|2014|p=[https://books.google.com/books?id=_iqTAwAAQBAJ&pg=PA123 123]}} }}</ref> [[Mixed-method research]] combines quantitative and qualitative methods to explore the same phenomena from a variety of perspectives to get a more comprehensive understanding.<ref>{{multiref | {{harvnb|Schoonenboom|Johnson|2017|pp=107–108}} | {{harvnb|Shorten|Smith|2017|pp=74–75}} }}</ref>

The progress of scientific knowledge is traditionally seen as a gradual and continuous process in which the existing body of knowledge is increased at each step. This view has been challenged by some philosophers of science, such as [[Thomas Kuhn]], who holds that between phases of incremental progress, there are so-called scientific revolutions in which a [[paradigm shift]] occurs. According to this view, some basic assumptions are changed due to the paradigm shift. This results in a radically new perspective on the body of scientific knowledge that is [[Commensurability (philosophy of science)|incommensurable]] with the previous outlook.<ref>{{multiref | {{harvnb|Pritchard|2013|pp=[https://books.google.com/books?id=sfUhAQAAQBAJ 123–125]|loc=11 Scientific Knowledge}} | {{harvnb|Niiniluoto|2019}} }}</ref>

[[Scientism]] refers to a group of views that privilege the sciences and the scientific method over other forms of inquiry and knowledge acquisition. In its strongest formulation, it is the claim that there is no other knowledge besides scientific knowledge.<ref>{{harvnb|Plantinga|2018|pp=[https://books.google.com/books?id=iWBmDwAAQBAJ&pg=PA222 222–223]}}</ref> A common critique of scientism, made by philosophers such as [[Hans-Georg Gadamer]] and [[Paul Feyerabend]], is that the fixed requirement of following the scientific method is too rigid and results in a misleading picture of reality by excluding various relevant phenomena from the scope of knowledge.<ref>{{multiref | {{harvnb|Flynn|2000|pp=83–84}} | {{harvnb|Clegg|2022|p=[https://books.google.com/books?id=DYNYEAAAQBAJ&pg=PA14 14]}} | {{harvnb|Mahadevan|2007|p=[https://books.google.com/books?id=LUX4TyOqWcwC&pg=PA91 91]}} | {{harvnb|Gauch|2003|p=[https://books.google.com/books?id=iVkugqNG9dAC&pg=PA88 88]}} }}</ref>

== In various disciplines ==
=== History ===
{{main|History of knowledge}}

The history of knowledge is the field of inquiry that studies how knowledge in different fields has developed and evolved in the course of history. It is closely related to the [[history of science]] but covers a wider area that includes knowledge from fields like [[History of philosophy|philosophy]], [[History of mathematics|mathematics]], [[History of education|education]], [[History of literature|literature]], [[History of art|art]], and [[History of religion|religion]]. It further covers practical knowledge of specific [[craft]]s, [[History of medicine|medicine]], and everyday practices. It investigates not only how knowledge is created and employed but also how it is disseminated and preserved.<ref>{{multiref | {{harvnb|Burke|2015|loc=1. Knowledges and Their Histories: § History and Its Neighbours, 3. Processes: § Four Stages, 3. Processes: § Oral Transmission}} | {{harvnb|Doren|1992|pp=xvi–xviii}} | {{harvnb|Daston|2017|pp=142–143}} | {{harvnb|Mulsow|2018|p=159}} }}</ref>

[[Prehistory|Before the ancient period]], knowledge about social conduct and survival skills was passed down orally and in the form of customs from one generation to the next.<ref>{{multiref | {{harvnb|Bowen|Gelpi|Anweiler|2023|loc=§ Introduction, Prehistoric and Primitive Cultures}} | {{harvnb|Bartlett|Burton|2007|p=15}} | {{harvnb|Fagan|Durrani|2016|p=[https://books.google.com/books?id=dCwlDwAAQBAJ&pg=PA15 15]}} | {{harvnb|Doren|1992|pp=3–4}} }}</ref> The [[ancient period]] saw the rise of major civilizations starting about 3000 BCE in [[Mesopotamia]], [[Ancient Egypt|Egypt]], [[Ancient India|India]], and [[Ancient China|China]]. The [[invention of writing]] in this period significantly increased the amount of stable knowledge within society since it could be stored and shared without being limited by [[Memory#Failures|imperfect human memory]].<ref>{{multiref | {{harvnb|Doren|1992|pp=xxiii–xxiv, 3–4}} | {{harvnb|Friesen|2017|pp=[https://books.google.com/books?id=0Ks-DwAAQBAJ&pg=PA17 17–18]}} | {{harvnb|Danesi|2013|pp=168–169}} | {{harvnb|Steinberg|1995|pp=[https://books.google.com/books?id=VPs3kidEqXYC&pg=PA3 3–4]}} | {{harvnb|Lanzer|2018|p=[https://books.google.com/books?id=UCRZDwAAQBAJ&pg=PA7 7]}} }}</ref> During this time, the first developments in scientific fields like mathematics, astronomy, and medicine were made. They were later formalized and greatly expanded by the [[Ancient Greece|ancient Greeks]] starting in the 6th century BCE. Other ancient advancements concerned knowledge in the fields of agriculture, law, and politics.<ref>{{multiref | {{harvnb|Doren|1992|pp=xxiii–xxiv, 3–4, 29–30}} | {{harvnb|Conner|2009|p=[https://books.google.com/books?id=EAo4DgAAQBAJ&pg=PT81 81]}} }}</ref>

[[File:Printing machine of Johanes Gutenbrg1.jpg|thumb|upright=.8|alt=Photo of a replica of the printing press created by Johannes Gutenberg|The invention of the printing press in the 15th century greatly expanded access to written materials.]]

In the [[medieval period]], religious knowledge was a central concern, and religious institutions, like the [[Catholic Church]] in Europe, influenced intellectual activity.<ref>{{multiref | {{harvnb|Burke|2015|loc=2. Concepts: § Authorities and Monopolies}} | {{harvnb|Kuhn|1992|p=[https://books.google.com/books?id=HQ41EAAAQBAJ&pg=PA106 106]}} | {{harvnb|Lanzer|2018|p=[https://books.google.com/books?id=UCRZDwAAQBAJ&pg=PA7 7]}} }}</ref> Jewish communities set up [[yeshiva]]s as centers for studying religious texts and [[Halakha|Jewish law]].<ref>{{multiref | {{harvnb|Bowker|2003|loc=[https://www.oxfordreference.com/display/10.1093/acref/9780192800947.001.0001/acref-9780192800947-e-8089?rskey=Ba4XPQ&result=1 Yeshivah ]}} | {{harvnb|Walton|2015|p=[https://books.google.com/books?id=Jv9tCAAAQBAJ&pg=PA130 130]}} }}</ref>  In the [[Muslim world]], [[madrasa]] schools were established and focused on [[Islamic law]] and [[Islamic philosophy]].<ref>{{multiref | {{harvnb|Johnson|Stearns|2023|pp=5, 43–44, 47}} | {{harvnb|Esposito|2003|loc=[https://www.oxfordreference.com/display/10.1093/oi/authority.20110803100125907 Madrasa]}} }}</ref> Many intellectual achievements of the ancient period were preserved, refined, and expanded during the [[Islamic Golden Age]] from the 8th to 13th centuries.<ref>{{multiref | {{harvnb|Trefil|2012|pp=[https://books.google.com/books?id=K-bGBQAAQBAJ&pg=PT63 63–64]}} | {{harvnb|Ashraf|2023|pp=[https://books.google.com/books?id=TozYEAAAQBAJ&pg=PT101 101–102]}} }}</ref> Centers of higher learning were established in this period in various regions, like [[Al-Qarawiyyin University]] in Morocco,<ref>{{harvnb|Aqil|Babekri|Nadmi|2020|p=[https://books.google.com/books?id=TGjvDwAAQBAJ&pg=PA156 156]}}</ref> the [[Al-Azhar University]] in Egypt,<ref>{{harvnb|Cosman|Jones|2009|p=[https://books.google.com/books?id=-Jf5t1vFw1QC&pg=PA148 148]}}</ref> the [[House of Wisdom]] in Iraq,<ref>{{harvnb|Gilliot|2018|p=[https://books.google.com/books?id=P-pGDwAAQBAJ&pg=PT81 81]}}</ref> and the first universities in Europe.<ref>{{multiref | {{harvnb|Bowen|Gelpi|Anweiler|2023|loc=§ The Development of the Universities}} | {{harvnb|Kemmis|Edwards-Groves|2017|p=[https://books.google.com/books?id=fFM7DwAAQBAJ&pg=PA50 50]}} }}</ref> This period also saw the formation of [[guilds]], which preserved and advanced technical and craft knowledge.<ref>{{harvnb|Power|1970|pp=[https://babel.hathitrust.org/cgi/pt?id=uc1.$b201970&view=1up&seq=273 243–244]}}</ref>

In the [[Renaissance]] period, starting in the 14th century, there was a renewed interest in the [[humanities]] and sciences.<ref>{{harvnb|Ashraf|2023|p=[https://books.google.com/books?id=TozYEAAAQBAJ&pg=PT159 159]}}</ref> The [[printing press]] was invented in the 15th century and significantly increased the availability of written media and general [[literacy]] of the population.<ref>{{multiref | {{harvnb|Steinberg|1995|p=[https://books.google.com/books?id=VPs3kidEqXYC&pg=PA5 5]}} | {{harvnb|Danesi|2013|pp=169–170}} }}</ref> These developments served as the foundation of the [[Scientific Revolution]] in the [[Age of Enlightenment]] starting in the 16th and 17th centuries. It led to an explosion of knowledge in fields such as physics, chemistry, biology, and the social sciences.<ref>{{multiref | {{harvnb|Doren|1992|pp=xxiv–xxv, 184–185}} | {{harvnb|Lanzer|2018|p=[https://books.google.com/books?id=UCRZDwAAQBAJ&pg=PA7 7]}} }}</ref> The technological advancements that accompanied this development made possible the [[Industrial Revolution]] in the 18th and 19th centuries.<ref>{{multiref | {{harvnb|Doren|1992|pp=xxiv–xxv, 213–214}} | {{harvnb|Lanzer|2018|p=[https://books.google.com/books?id=UCRZDwAAQBAJ&pg=PA7 7]}} }}</ref> In the 20th century, the development of computers and the Internet led to a vast expansion of knowledge by revolutionizing how knowledge is stored, shared, and created.<ref>{{multiref | {{harvnb|Lanzer|2018|p=[https://books.google.com/books?id=UCRZDwAAQBAJ&pg=PA8 8]}} | {{harvnb|Danesi|2013|pp=178–181}} }}</ref>

=== Religion ===
{{See also|Desacralization of knowledge|Resacralization of knowledge}}
Knowledge plays a central role in many religions. Knowledge claims about the [[existence of God]] or [[religious doctrine]]s about how each one should live their lives are found in almost every culture.<ref>{{harvnb|Clark|2022|loc=Lead Section, § 2. The Evidentialist Objection to Belief in God}}</ref> However, such knowledge claims are often controversial and are commonly rejected by [[Religious skepticism|religious skeptics]] and [[atheists]].<ref name=Penelhum1971>{{harvnb|Penelhum|1971|loc=[https://books.google.com/books?id=QQU9AAAAIAAJ 1. Faith, Scepticism and Philosophy]}}</ref> The [[Religious epistemology|epistemology of religion]] is the field of inquiry studying whether [[belief in God]] and in other religious doctrines is [[rational]] and amounts to knowledge.<ref>{{multiref | {{harvnb|Clark|2022|loc=Lead Section}} | {{harvnb|Forrest|2021|loc=Lead Section, § 1. Simplifications}} }}</ref> One important view in this field is [[evidentialism]], which states that belief in religious doctrines is justified if it is supported by sufficient evidence. Suggested examples of evidence for religious doctrines include [[religious experience]]s such as direct contact with the divine or inner testimony when hearing God's voice.<ref>{{multiref | {{harvnb|Clark|2022|loc=Lead Section, § 2. The Evidentialist Objection to Belief in God}} | {{harvnb|Forrest|2021|loc=Lead Section, § 2. The Rejection of Enlightenment Evidentialism}} | {{harvnb|Dougherty|2014|pp=97–98}} }}</ref> Evidentialists often reject that belief in religious doctrines amounts to knowledge based on the claim that there is not sufficient evidence.<ref>{{multiref | {{harvnb|Clark|2022|loc=§ 2. The Evidentialist Objection to Belief in God}} | {{harvnb|Forrest|2021|loc=Lead Section, 2. The Rejection of Enlightenment Evidentialism}} }}</ref> A famous saying in this regard is due to Bertrand Russell. When asked how he would justify his lack of belief in God when facing his judgment after death, he replied "Not enough evidence, God! Not enough evidence."<ref>{{harvnb|Clark|2022|loc=§ 2. The Evidentialist Objection to Belief in God}}</ref>

However, religious teachings about the existence and nature of God are not always seen as knowledge claims by their defenders. Some explicitly state that the proper attitude towards such doctrines is not knowledge but [[faith]]. This is often combined with the assumption that these doctrines are true but cannot be fully understood by reason or verified through rational inquiry. For this reason, it is claimed that one should accept them even though they do not amount to knowledge.<ref name=Penelhum1971/> Such a view is reflected in a famous saying by Immanuel Kant where he claims that he "had to deny knowledge in order to make room for faith."<ref>{{harvnb|Stevenson|2003|pp=[https://www.cambridge.org/core/journals/kantian-review/article/abs/opinion-belief-or-faith-and-knowledge/9519081ED9BAE7811D2B9670340AD7E1 72–73]}}</ref>

Distinct religions often differ from each other concerning the doctrines they proclaim as well as their understanding of the role of knowledge in religious practice.<ref>{{multiref | {{harvnb|Paden|2009|pp=[https://www.taylorfrancis.com/chapters/edit/10.4324/9780203868768-19/comparative-religion-william-paden 225–227]}} | {{harvnb|Bouquet|1962|p=[https://books.google.com/books?id=zQ49AAAAIAAJ&pg=PA1 1]}} }}</ref> In both the Jewish and the Christian traditions, knowledge plays a role in the [[fall of man]], in which Adam and Eve were expelled from the [[Garden of Eden]]. Responsible for this fall was that they ignored God's command and ate from the [[Tree of the knowledge of good and evil|tree of knowledge]], which gave them the knowledge of good and evil. This is seen as a rebellion against God since this knowledge belongs to God and it is not for humans to decide what is right or wrong.<ref>{{multiref | {{harvnb|Carson|Cerrito|2003|p=164}} | {{harvnb|Delahunty|Dignen|2012|p=365}} | {{harvnb|Blayney|1769|loc=[https://en.wikisource.org/wiki/Bible_(King_James)/Genesis#3:22 Genesis]}} }}</ref> In the Christian literature, knowledge is seen as one of the [[seven gifts of the Holy Spirit]].<ref>{{harvnb|Vost|2016|pp=[https://books.google.com/books?id=pdaiDQAAQBAJ&pg=PA75 75–76]}}</ref> In [[Islam]], "the Knowing" (''al-ʿAlīm'') is one of the [[Names of God in the Qur'an|99 names]] reflecting distinct attributes of [[God in Islam|God]]. The [[Qur'an]] asserts that knowledge comes from God and the acquisition of knowledge is encouraged in the [[Hadith|teachings of Muhammad]].<ref>{{multiref | {{harvnb|Campo|2009|p=[https://books.google.com/books?id=OZbyz_Hr-eIC&pg=PA515 515]}} | {{harvnb|Swartley|2005|p=[https://books.google.com/books?id=gLi2X1rzeZIC&pg=PA63 63]}} }}</ref>

[[File:Saraswati - Raja Ravi Varma.jpg|thumb|upright=.8|alt=Oil painting showing Saraswati|[[Saraswati]] is the goddess of knowledge and the arts in Hinduism.]]
In Buddhism, knowledge that leads to [[Enlightenment in Buddhism|liberation]] is called ''vijjā''. It contrasts with ''[[avijjā]]'' or ignorance, which is understood as the root of all [[Duḥkha|suffering]]. This is often explained in relation to the claim that humans suffer because they crave things that are [[Impermanence#Buddhism|impermanent]]. The ignorance of the impermanent nature of things is seen as the factor responsible for this craving.<ref>{{multiref | {{harvnb|Burton|2002|pp=[https://www.jstor.org/stable/1400322 326–327]}} | {{harvnb|Chaudhary|2017|pp=202–203|loc=Avijjā}} | {{harvnb|Chaudhary|2017|pp=1373–1374|loc=Wisdom (Buddhism)}} }}</ref> The central goal of Buddhist practice is to stop suffering. This aim is to be achieved by understanding and practicing the teaching known as the [[Four Noble Truths]] and thereby overcoming ignorance.<ref>{{multiref | {{harvnb|Chaudhary|2017|pp=202–203|loc=Avijjā}} | {{harvnb|Chaudhary|2017|pp=1373–1374|loc=Wisdom (Buddhism)}} }}</ref> Knowledge plays a key role in the classical path of Hinduism known as ''[[Jnana yoga|jñāna yoga]]'' or "path of knowledge". It aims to achieve oneness with the divine by fostering an understanding of the self and its relation to [[Brahman]] or ultimate reality.<ref>{{multiref | {{harvnb|Jones|Ryan|2006|loc=[https://books.google.com/books?id=OgMmceadQ3gC jnana]}} | {{harvnb|Jones|Ryan|2006|loc=[https://books.google.com/books?id=OgMmceadQ3gC Bhagavad Gita]}} }}</ref>

=== Anthropology ===
The ''anthropology of knowledge'' is a multi-disciplinary field of inquiry.<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Boyer|2007|loc=1. Of Dialectical Germans and Dialectical Ethnographers: Notes from an Engagement with Philosophy}} }}</ref> It studies how knowledge is acquired, stored, retrieved, and communicated.<ref>{{harvnb|Cohen|2010|pp=[https://www.jstor.org/stable/40606072 S193–S202]}}</ref> Special interest is given to how knowledge is reproduced and changes in relation to social and cultural circumstances.<ref name=Allwood2013>{{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}}</ref> In this context, the term ''knowledge'' is used in a very broad sense, roughly equivalent to terms like ''understanding'' and ''culture''.<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Barth|2002|p=1}} }}</ref> This means that the forms and reproduction of understanding are studied irrespective of their [[truth value]]. In epistemology, by contrast, knowledge is usually restricted to forms of true belief. The main focus in [[anthropology]] is on [[Empirical evidence|empirical observations]] of how people ascribe truth values to meaning contents, like when affirming an assertion, even if these contents are false.<ref name=Allwood2013/> This also includes practical components: knowledge is what is employed when interpreting and acting on the world and involves diverse phenomena, such as feelings, embodied skills, information, and concepts. It is used to understand and anticipate events to prepare and react accordingly.<ref>{{harvnb|Barth|2002|pp=1–2}}</ref>

The reproduction of knowledge and its changes often happen through some form of communication used to [[Knowledge transfer|transfer knowledge]].<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Cohen|2010|pp=[https://www.jstor.org/stable/40606072 S193–S202]}} }}</ref> This includes face-to-face discussions and online communications as well as seminars and rituals. An important role in this context falls to institutions, like university departments or scientific journals in the academic context.<ref name=Allwood2013/> Anthropologists of knowledge understand traditions as knowledge that has been reproduced within a society or geographic region over several generations. They are interested in how this reproduction is affected by external influences. For example, societies tend to interpret knowledge claims found in other societies and incorporate them in a modified form.<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Barth|2002|pp=1–4 }} | {{harvnb|Kuruk|2020|p=[https://books.google.com/books?id=ia7ZDwAAQBAJ&pg=PT25 25]}} }}</ref>

Within a society, people belonging to the same social group usually understand things and organize knowledge in similar ways to one another. In this regard, social identities play a significant role: people who associate themselves with similar identities, like age-influenced, professional, religious, and ethnic identities, tend to embody similar forms of knowledge. Such identities concern both how a person sees themselves, for example, in terms of the ideals they pursue, as well as how other people see them, such as the expectations they have toward the person.<ref>{{multiref | {{harvnb|Allwood|2013|pp=[https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 69–72]}} | {{harvnb|Hansen|1982|p=193}} }}</ref>

=== Sociology ===
{{main|Sociology of knowledge}}
The sociology of knowledge is the subfield of sociology that studies how thought and society are related to each other.<ref name="auto1">{{multiref | {{harvnb|Coser|2009|loc=[https://www.encyclopedia.com/social-sciences-and-law/sociology-and-social-reform/sociology-general-terms-and-concepts/sociology-knowledge Knowledge, Sociology of]}} | {{harvnb|Tufari|2003|loc=[https://books.google.com/books?id=4C0KAQAAMAAJ Knowledge, Sociology of]}} | {{harvnb|Scheler|Stikkers|2012|p=[https://books.google.com/books?id=pFqrO7Lxiw4C&pg=PA23 23]}} }}</ref> Like the anthropology of knowledge, it understands "knowledge" in a wide sense that encompasses philosophical and political ideas, religious and ideological doctrines, folklore, law, and technology. The sociology of knowledge studies in what sociohistorical circumstances knowledge arises, what consequences it has, and on what existential conditions it depends. The examined conditions include physical, demographic, economic, and sociocultural factors. For instance, philosopher [[Karl Marx]] claimed that the dominant ideology in a society is a product of and changes with the underlying socioeconomic conditions.<ref name="auto1"/> Another example is found in forms of decolonial scholarship that claim that colonial powers are responsible for the [[hegemony]] of Western knowledge systems. They seek a [[decolonization of knowledge]] to undermine this hegemony.<ref>{{multiref | {{harvnb|Lee|2017|p=[https://books.google.com/books?id=ZtArDwAAQBAJ&pg=PT67 67]}} | {{harvnb|Dreyer|2017|pp=1–7}} }}</ref>

=== Others ===
[[Formal epistemology]] studies knowledge using formal tools found in mathematics and logic.<ref>{{harvnb|Weisberg|2021}}</ref> An important issue in this field concerns the epistemic principles of knowledge. These are rules governing how knowledge and related states behave and in what relations they stand to each other. The transparency principle, also referred to as the ''luminosity of knowledge'', states that knowing something implies the second-order knowledge that one knows it. This principle implies that if Heike knows that today is Monday, then she also knows that she knows that today is Monday.<ref>{{multiref | {{harvnb|Steup|Neta|2020|loc=§ 3.3 Internal Vs. External}} | {{harvnb|Das|Salow|2018|pp=[https://philpapers.org/rec/DASTAT-2 3–4]}} | {{harvnb|Dokic|Égré|2009|pp=[https://philpapers.org/rec/DOKMFE-2 1–2]}} }}</ref> According to the conjunction principle, if a person has justified beliefs in two separate propositions, then they are also justified in believing the [[Logical conjunction|conjunction]] of these two propositions. In this regard, if Bob has a justified belief that dogs are animals and another justified belief that cats are animals, then he is justified to believe the conjunction of these two propositions, i.e. that both dogs and cats are animals. Other commonly discussed principles are the closure principle and the evidence transfer principle.<ref>{{harvnb|Klein|1998|loc=§ 7. Epistemic Principles}}</ref>

[[Knowledge management]] is the process of creating, gathering, storing, and sharing knowledge. It involves the management of information assets that can take the form of [[document]]s, [[database]]s, policies, and procedures. It is of particular interest in the field of business and [[organizational development]], as it directly impacts [[decision-making]] and [[strategic planning]]. Knowledge management efforts are often employed to increase [[operational efficiency]] in attempts to gain a [[competitive advantage]].<ref>{{multiref | {{harvnb|Lengnick-Hall|Lengnick-Hall|2003|p=[https://books.google.com/books?id=t8RLT77_VHMC&pg=PA85 85]}} | {{harvnb|Awad|Ghaziri|2003|p=[https://books.google.com/books?id=qzREBAAAQBAJ&pg=PT28 28]}} }}</ref> Key processes in the field of knowledge management are knowledge creation, [[Data storage|knowledge storage]], [[knowledge sharing]], and knowledge application. Knowledge creation is the first step and involves the production of new information. Knowledge storage can happen through media like books, audio recordings, film, and digital databases. Secure storage facilitates knowledge sharing, which involves the transmission of information from one person to another. For the knowledge to be beneficial, it has to be put into practice, meaning that its insights should be used to either improve existing practices or implement new ones.<ref>{{multiref | {{harvnb|Suzanne|2021|pp=[https://books.google.com/books?id=ht8XEAAAQBAJ&pg=PA114 114–115]}} | {{harvnb|Choo|2002|pp=503–504}} | {{harvnb|Witzel|2004|p=[https://books.google.com/books?id=riM-iG8Ib64C&pg=PT252 252]}} }}</ref>

[[Knowledge representation]] is the process of storing organized information, which may happen using various forms of media and also includes information stored in the mind.<ref>{{multiref | {{harvnb|Sonneveld|Loening|1993|p=[https://books.google.com/books?id=BbBBAAAAQBAJ&pg=PA188 188]}} | {{harvnb|Markman|2006|p=1}} | {{harvnb|Shapiro|2006|p=1}} }}</ref> It plays a key role in the [[artificial intelligence]], where the term is used for the field of inquiry that studies how computer systems can efficiently represent information. This field investigates how different [[data structure]]s and interpretative procedures can be combined to achieve this goal and which formal languages can be used to express knowledge items. Some efforts in this field are directed at developing general languages and systems that can be employed in a great variety of domains while others focus on an optimized representation method within one specific domain. Knowledge representation is closely linked to [[automatic reasoning]] because the purpose of knowledge representation formalisms is usually to construct a [[knowledge base]] from which [[inference]]s are drawn.<ref>{{multiref | {{harvnb|Castilho|Lopes|2009|p=[https://books.google.com/books?id=aOeAoTz24jUC&pg=PA287 287]}} | {{harvnb|Kandel|1992|pp=[https://books.google.com/books?id=9r4dh4pdQNkC&pg=PA5 5–6]}} | {{harvnb|Cai|Liu|Chen|Wang|2021|p=[https://books.google.com/books?id=x30xEAAAQBAJ&pg=PA21 21]}} }}</ref> Influential knowledge base formalisms include logic-based systems, [[rule-based system]]s, [[semantic networks]], and [[Frame (artificial intelligence)|frames]]. Logic-based systems rely on [[formal language]]s employed in [[logic]] to represent knowledge. They use linguistic devices like individual terms, [[Predicate (mathematical logic)|predicates]], and [[Quantifier (logic)|quantifiers]]. For rule-based systems, each unit of information is expressed using a conditional production rule of the form "if A then B". Semantic nets model knowledge as a [[Graph (discrete mathematics)|graph]] consisting of [[Vertex (graph theory)|vertices]] to represent facts or concepts and edges to represent the relations between them. Frames provide complex taxonomies to group items into classes, subclasses, and instances.<ref>{{multiref | {{harvnb|Castilho|Lopes|2009|pp=[https://books.google.com/books?id=aOeAoTz24jUC&pg=PA287 287–288]}} | {{harvnb|Kandel|1992|pp=[https://books.google.com/books?id=9r4dh4pdQNkC&pg=PA5 5–6]}} | {{harvnb|Akerkar|Sajja|2010|pp=[https://books.google.com/books?id=Tj8r3A-0dZkC&pg=PA71 71–72]}} }}</ref>

== See also ==
{{div col|colwidth=26em}}
* {{Annotated link|Epistemic modal logic}}
* {{Annotated link|Ignorance}}
* {{Annotated link|Knowledge falsification}}
* {{Annotated link|Omniscience}}
* {{Annotated link|Outline of knowledge}}
{{div col end}}

== References ==
=== Notes ===
{{Reflist|group=lower-alpha|30em}}

=== Citations ===
{{Reflist|23em}}

===Sources===
{{refbegin|30em}}
* {{cite web |publisher=HarperCollins |title=Knowledge |url=https://www.ahdictionary.com/word/search.html?q=knowledge |access-date=25 October 2022 |author=AHD staff |date=2022a |website=The American Heritage Dictionary |archive-date=29 November 2022 |archive-url=https://web.archive.org/web/20221129072236/https://www.ahdictionary.com/word/search.html?q=knowledge |url-status=live }}
* {{cite web |title=Knowledge Base |url=https://www.ahdictionary.com/word/search.html?q=knowledge+base |publisher=HarperCollins |access-date=25 October 2022 |author=AHD staff |date=2022b |website=The American Heritage Dictionary |archive-date=19 March 2022 |archive-url=https://web.archive.org/web/20220319181514/https://ahdictionary.com/word/search.html?q=knowledge+base |url-status=live }}
* {{cite web |author=AHD staff |publisher=HarperCollins |title=Intelligence |url=https://www.ahdictionary.com/word/search.html?q=intelligence&submit.x=58&submit.y=14 |website=The American Heritage Dictionary |access-date=7 March 2023 |date=2022c |archive-date=8 January 2024 |archive-url=https://web.archive.org/web/20240108124050/https://www.ahdictionary.com/word/search.html?q=intelligence&submit.x=58&submit.y=14 |url-status=live }}
* {{cite web |author1=AHD Staff |title=Social Science |url=https://www.ahdictionary.com/word/search.html?q=social+science&submit.x=58&submit.y=14 |website=The American Heritage Dictionary |publisher=HarperCollins |date=2022d}}
* {{cite web |author1=AHD Staff |title=Confabulate |url=https://www.ahdictionary.com/word/search.html?q=confabulation&submit.x=58&submit.y=14 |website=The American Heritage Dictionary |publisher=HarperCollins |date=2022e}}
* {{cite book |last1=Akerkar |first1=Rajendra |last2=Sajja |first2=Priti |title=Knowledge-Based Systems |publisher=Jones & Bartlett Learning |date=2010 |url=https://books.google.com/books?id=Tj8r3A-0dZkC&pg=PA71 |isbn=978-0-7637-7647-3 |access-date=2 December 2023 |archive-date=2 December 2023 |archive-url=https://web.archive.org/web/20231202183024/https://books.google.com/books?id=Tj8r3A-0dZkC&pg=PA71 |url-status=live }}
* {{cite book |last=Allen |first=Barry |date=2005 |chapter=Knowledge |editor-last=Horowitz |editor-first=Maryanne Cline |editor-link=Maryanne Cline Horowitz |title=New Dictionary of the History of Ideas |volume=3 |publisher=[[Charles Scribner's Sons]] |pages=1199–1204 |isbn=978-0-684-31377-1 |oclc=55800981 |archive-url=https://web.archive.org/web/20170822095315/https://www.encyclopedia.com/science-and-technology/computers-and-electrical-engineering/computers-and-computing/knowledge |archive-date=22 August 2017 |chapter-url=https://www.encyclopedia.com/science-and-technology/computers-and-electrical-engineering/computers-and-computing/knowledge }}
* {{cite book |last1=Allwood |first1=Carl Martin |title=The Encyclopedia of Cross-Cultural Psychology |date=2013 |publisher=John Wiley & Sons, Inc. |isbn=978-1-118-33989-3 |pages=69–72 |url=https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 |language=en |chapter=Anthropology of Knowledge |doi=10.1002/9781118339893.wbeccp025 |access-date=26 September 2022 |archive-date=26 September 2022 |archive-url=https://web.archive.org/web/20220926085332/https://onlinelibrary.wiley.com/doi/abs/10.1002/9781118339893.wbeccp025 |url-status=live }}
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* {{cite web |title=APA Dictionary of Psychology: Situated Knowledge |url=https://dictionary.apa.org/situated-knowledge |access-date=18 September 2022 |language=en |author=APA staff |date=2022 |archive-date=20 September 2022 |archive-url=https://web.archive.org/web/20220920171203/https://dictionary.apa.org/situated-knowledge |url-status=live }}
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* {{cite book |last1=Burke |first1=Peter |title=What Is the History of Knowledge? |date=2015 |publisher=John Wiley & Sons |isbn=978-1-5095-0306-3 |url=https://books.google.com/books?id=ETtcCwAAQBAJ |language=en |access-date=29 November 2023 |archive-date=2 December 2023 |archive-url=https://web.archive.org/web/20231202184226/https://books.google.com/books?id=ETtcCwAAQBAJ |url-status=live }}
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* {{cite book |last1=Magee |first1=Bryan |author1-link=Bryan Magee |last2=Popper |first2=Karl R. |author2-link=Karl Popper |date=1971 |chapter=Conversation with Karl Popper |editor-last=Magee |editor-first=Bryan |title=Modern British Philosophy |publisher=St. Martin's Press |pages=[https://archive.org/details/modernbritishphi0000mage/page/74 74–75] |oclc=314039 |chapter-url=https://archive.org/details/modernbritishphi0000mage/page/66 |chapter-url-access=registration |isbn=978-0-19-283047-0 |quote=Popper: Putting our ideas into words, or better, writing them down, makes an important difference. ... It is what I call 'knowledge in the objective sense'. Scientific knowledge belongs to it. It is this knowledge which is stored in our libraries rather than our heads. Magee: And you regard the knowledge stored in our libraries as more important than the knowledge stored in our heads. Popper: Much more important, from every point of view }}
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* {{cite book |last1=Moser |first1=Paul K. |title=The Oxford Handbook of Epistemology |chapter=13. Scientific Knowledge |date=2005 |publisher=Oxford University Press |isbn=978-0-19-020818-9 |url=https://books.google.com/books?id=5NJjAwAAQBAJ |language=en |access-date=8 March 2023 |archive-date=19 May 2023 |archive-url=https://web.archive.org/web/20230519082259/https://books.google.com/books?id=5NJjAwAAQBAJ |url-status=live }}
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* {{cite book |last1=Paden |first1=William E. |title=The Routledge Companion to the Study of Religion |date=2009 |publisher=Routledge |url=https://www.taylorfrancis.com/chapters/edit/10.4324/9780203868768-19/comparative-religion-william-paden |chapter=Comparative Religion |pages=239–256 |doi=10.4324/9780203868768-19 |isbn=978-0-203-86876-8 |access-date=21 September 2022 |archive-date=21 September 2022 |archive-url=https://web.archive.org/web/20220921184650/https://www.taylorfrancis.com/chapters/edit/10.4324/9780203868768-19/comparative-religion-william-paden |url-status=live }}
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* {{cite book |last1=Vempala |first1=Naresh N. |editor1-last=Thompson |editor1-first=William Forde |title=Music in the Social and Behavioral Sciences: An Encyclopedia |date=2014 |publisher=SAGE Publications |isbn=978-1-4522-8302-9 |chapter-url=https://books.google.com/books?id=qfcOBAAAQBAJ&pg=PA277 |language=en |chapter=Creativity, Theories of Musical |access-date=30 November 2023 |archive-date=2 December 2023 |archive-url=https://web.archive.org/web/20231202184224/https://books.google.com/books?id=qfcOBAAAQBAJ&pg=PA277 |url-status=live }}
* {{cite book |last1=Vost |first1=Kevin |title=Seven Gifts of the Holy Spirit |date=2016 |publisher=Sophia Institute Press |isbn=978-1-62282-412-0 |pages=75–76 |url=https://books.google.com/books?id=pdaiDQAAQBAJ&pg=PA75 |language=en |access-date=7 March 2023 |archive-date=7 March 2023 |archive-url=https://web.archive.org/web/20230307134743/https://books.google.com/books?id=pdaiDQAAQBAJ&pg=PA75 |url-status=live }}
* {{cite journal |last=Walton |first=Douglas N. |author-link=Douglas N. Walton |date=2005 |title=Pragmatic and Idealized Models of Knowledge and Ignorance |journal=[[American Philosophical Quarterly]] |volume=42 |issue=1 |pages=59–69 [59, 64] |jstor=20010182 |quote=It is a pervasive assumption in recent analytical philosophy that knowledge can be defined as a modality representing a rational agent's true and consistent beliefs. Such views are based on rationality assumptions. One is that knowledge can only consist of true propositions. This way of speaking is sharply at odds with the way we speak about knowledge, for example, in computing, where a so-called knowledge base can be a database, that is, a set of data that has been collected and is thought to consist of true propositions, even though, realistically speaking, many of them might later be shown to be false or untenable. ... The pragmatic account of knowledge starts with a knowledge system, meaning a working system with an agent having a database. ... The notion of a search can be a social one, in many instances. A group of agents can be engaged in the search, and some of them can know things that others do not know.}}
* {{cite book |last1=Walton |first1=Linda |chapter=Educational Institutions |editor-last1=Kedar |editor-first1=Benjamin Z. |editor-last2=Wiesner-Hanks |editor-first2=Merry E. |title=The Cambridge World History: Volume 5, Expanding Webs of Exchange and Conflict, 500CE–1500CE |date=9 April 2015 |publisher=Cambridge University Press |isbn=978-1-316-29775-9 |url=https://books.google.com/books?id=Jv9tCAAAQBAJ |language=en |access-date=15 December 2023 |archive-date=18 November 2022 |archive-url=https://web.archive.org/web/20221118094909/https://books.google.com/books?id=Jv9tCAAAQBAJ |url-status=live }}
* {{cite web |last1=Weisberg |first1=Jonathan |title=Formal Epistemology |url=https://plato.stanford.edu/entries/formal-epistemology/ |website=[[Stanford Encyclopedia of Philosophy]] |publisher=Metaphysics Research Lab, Stanford University |access-date=5 June 2022 |date=2021 |archive-date=14 March 2015 |archive-url=https://web.archive.org/web/20150314172053/https://plato.stanford.edu/entries/formal-epistemology/ |url-status=live }}
* {{cite web |last1=Williams |first1=Garrath |title=Kant’s Account of Reason |url=https://plato.stanford.edu/entries/kant-reason/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=29 February 2024 |date=2023}}
* {{cite book |last1=Wilson |first1=Timothy D. |title=Strangers to ourselves: discovering the adaptive unconscious |date=2002 |publisher=Harvard university Press |isbn=0-674-00936-3}}
* {{cite book |last1=Wilson |first1=John P. |last2=Cattell |first2=Alan |chapter=7. Knowledge Management |editor-last1=Wilson |editor-first1=John P. |title=Human Resource Development: Learning & Training for Individuals & Organizations |date=2005 |publisher=Kogan Page Publishers |isbn=978-0-7494-4352-8 |chapter-url=https://books.google.com/books?id=zpNc_GZIiikC&pg=PA118 |language=en |access-date=5 December 2023 |archive-date=5 December 2023 |archive-url=https://web.archive.org/web/20231205132018/https://books.google.com/books?id=zpNc_GZIiikC&pg=PA118 |url-status=live }}
* {{cite web |last1=Windt |first1=Jennifer M. |title=Dreams and Dreaming |url=https://plato.stanford.edu/entries/dreams-dreaming/#CartDreaSkep |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=12 December 2023 |date=2021 |archive-date=1 February 2024 |archive-url=https://web.archive.org/web/20240201125124/https://plato.stanford.edu/entries/dreams-dreaming/#CartDreaSkep |url-status=live }}
* {{cite book |last1=Wise |first1=C. |title=Chomsky and Deconstruction: The Politics of Unconscious Knowledge |date=2011 |publisher=Springer |isbn=978-0-230-11705-1 |url=https://books.google.com/books?id=EathAQAAQBAJ&pg=PT80 |language=en |access-date=3 December 2023 |archive-date=3 December 2023 |archive-url=https://web.archive.org/web/20231203185739/https://books.google.com/books?id=EathAQAAQBAJ&pg=PT80 |url-status=live }}
* {{cite book |last1=Witzel |first1=Morgen |title=Management: The Basics |date=2004 |publisher=Routledge |isbn=978-1-134-36172-4 |url=https://books.google.com/books?id=riM-iG8Ib64C&pg=PT252 |access-date=2 December 2023 |archive-date=2 December 2023 |archive-url=https://web.archive.org/web/20231202181104/https://books.google.com/books?id=riM-iG8Ib64C&pg=PT252 |url-status=live }}
* {{cite journal |last1=Woolf |first1=Raphael |title=Plato and the Norms of Thought |journal=Mind |date=2013 |volume=122 |issue=485 |pages=171–216 |doi=10.1093/mind/fzt012 |url=https://academic.oup.com/mind/article/122/485/171/961176 |issn=0026-4423 |access-date=18 September 2022 |archive-date=20 September 2022 |archive-url=https://web.archive.org/web/20220920172241/https://academic.oup.com/mind/article/122/485/171/961176 |url-status=live |doi-access=free }}
* {{cite book |last1=Woolfolk |first1=Anita |last2=Margetts |first2=Kay |title=Educational Psychology Australian Edition |date=2012 |publisher=Pearson Higher Education AU |isbn=978-1-4425-5145-9 |page=251 |url=https://books.google.com/books?id=whziBAAAQBAJ&pg=PA251 |language=en |access-date=16 April 2023 |archive-date=6 April 2023 |archive-url=https://web.archive.org/web/20230406151913/https://books.google.com/books?id=whziBAAAQBAJ&pg=PA251 |url-status=live }}
* {{cite book |last1=Yanofsky |first1=Noson S. |title=The Outer Limits of Reason: What Science, Mathematics, and Logic Cannot Tell Us |date=2013 |publisher=The MIT Press |isbn=978-0-262-01935-4}}
* {{cite book |last1=Zagzebski |first1=Linda |author1-link=Linda Zagzebski |date=1999 |chapter=What Is Knowledge? |editor1-last=Greco |editor1-first=John |editor2-last=Sosa |editor2-first=Ernest |title=The Blackwell Guide to Epistemology |publisher=Blackwell |pages=92–116 |chapter-url=https://philpapers.org/rec/ZAGWIK |isbn=978-0-631-20290-5 |oclc=39269507 |doi=10.1002/9781405164863.ch3 |s2cid=158886670 |access-date=12 June 2022 |archive-date=2 June 2022 |archive-url=https://web.archive.org/web/20220602215147/https://philpapers.org/rec/ZAGWIK |url-status=live }}
{{refend}}

== External links ==
* {{PhilPapers|category|knowledge}}
* {{cite IEP |url-id=epistemic-value |title=Epistemic Value }}
* {{InPho|taxonomy|2390}}

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