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Foundationalism is any theory in epistemology (typically, theories of justification, but also of knowledge) that holds that beliefs are justified (known, etc.) based on what are called basic beliefs (also commonly called foundational beliefs). Basic beliefs are beliefs that give justificatory support to other beliefs, and more derivative beliefs are based on those more basic beliefs. The basic beliefs are said to be self-justifying or self-evident, that is, they are justified, although not justified by other beliefs. Typically and historically, foundationalists have held either that basic beliefs are justified by mental events or states, such as experiences, that do not constitute beliefs (these are called nondoxastic mental states), or that they simply are not the type of thing that can be (or needs to be) justified.

Hence, generally, a foundationalist might offer the following theory of justification:

A belief is epistemically justified if and only if (1) it is justified by a basic belief or beliefs, or (2) it is justified by a chain of beliefs that is supported by a basic belief or beliefs, and on which all the others are ultimately based.

A basic belief, on the other hand, does not require justification because it is a different kind of belief than a non-foundational one.

Arguments for foundationalism

Foundationalists generally tend to argue that there must be some set of epistemologically basic propositions or else the process of justification will always lead to Agrippa's Trilemma, which ends in either an infinite regress, a dogmatic stopping point, or a circular argument, none of which are logically valid.

Historical foundationalism: rationalism vs. empiricism

Historically, two varieties of foundationalist theories were rationalism (or continental rationalism, to refer to the historical movement) and empiricism (or British Empiricism). Strictly speaking, neither empiricism nor rationalism is committed to foundationalism (it is possible to be an empiricist coherentist, for example, and that was a common epistemological position in 20th century philosophy).

Rationalism is the general name for epistemological theories that maintain that reason is the source and criterion of knowledge. Rationalists generally hold that so-called truths of reason are the (most important) epistemologically basic propositions. The historical continental rationalism expounded by René Descartes rejected empiricism entirely, while modern rationalism asserts that reason is strongest when it is supported by or consistent with evidence and hence relies heavily on empirical science in analyzing justifications for belief. René Descartes famously held that some of these truths are known innately and therefore constitute epistemologically basic innate knowledge, a view not commonly held in modern rationalism.

Empiricism is the general name for epistemological theories that maintain that sensation reports are the source and criterion of knowledge. Classical empiricists generally held that such reports are indubitable and incorrigible and therefore worthy of serving as epistemologically basic propositions.

Alternatives to foundationalism

Alternatives to foundationalism, usually called Anti-foundationalism, include coherentism and reliabilism (though this has sometimes been construed as an unusual variant of foundationalism). Contextualism (or, in a stripped-down version, the blind posits theory) is the epistemological version of relativism; relativism is more often regarded as a theory of truth than as a theory of justification or knowledge. Also see Pragmatism.

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