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In epistemology, foundherentism is a theory of justification that combines elements from the two rival theories addressing infinite regress, foundationalism prone to arbitrariness, and coherentism prone to circularity (problems raised by Münchhausen Trilemma). Foundherentism was developed and defended by Susan Haack in Evidence and Inquiry: Towards Reconstruction in Epistemology (1993).
In principle, foundationalism holds that basic beliefs unilaterally support derived beliefs, with support always directed from the former to the latter; coherentism holds that beliefs mutually support each other when they belong to the same coherent belief-set. As these theories were refined, however, some foundationalists began to admit that even basic beliefs could be fallible, and that derived beliefs could mutually support each other; whereas some coherentists began to admit that experiential beliefs should be weighted so as to reflect realistic degrees of coherence or justification. So the rival theories began to lean closer together. Moreover, those foundationalists who wondered why there couldn't be mutual support between basic and derived beliefs were in danger of falling into coherentism. Those coherentists who wondered why experiential beliefs should be weighted more heavily than others were also falling into foundationalism.
Haack argues that foundationalism and coherentism don't exhaust the field, and that an intermediate theory is more plausible than either. It is possible to include the relevance of experience for the justification of empirical beliefs, as experientialist foundationalism does but coherentism does not, and at the same time, instead of requiring a privileged class of basic beliefs, to allow for pervasive mutual dependence among beliefs, as coherentism does but foundationalism does not. These are the key ideas of foundherentism. Precursors of Haack's view include Bertrand Russell's epistemology, in which both empirical foundations and coherence are components of justification.
Haack introduces the analogy of the crossword puzzle to serve as a way of understanding how there can be mutual support among beliefs (as there is mutual support among crossword entries) without vicious circularity. The analogy between the structure of evidence and the crossword puzzle helps with another problem too. The clues to a crossword are the analogue of a person's experiential evidence, and the already-completed intersecting entries the analogue of his reasons for a belief. She claims that her metaphor has proven particularly fruitful in her own work, and has been found useful by many readers, not only philosophers but also scientists, economists, legal scholars, etc.
- Susan Haack (1993), Evidence and Inquiry (Evidence and inquiry ed.), Oxford, UK: Blackwell, ISBN 0-631-11851-9, 0631118519
- Aune, B. (1996). "Haack's Evidence and Inquiry". Philosophy and Phenomenological Research 56 (3): 627–632. doi:10.2307/2108389.
- Russell, Bertrand (1912). Problems of Philosophy.
See also 
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