Coherentism is a family of theories in epistemology according to which epistemic justification depends on how beliefs fit together within a system. A belief is justified through its relations of support to other beliefs, rather than solely through a chain of reasoning terminating in independently justified basic beliefs. Coherentists disagree about what coherence consists in and whether it is necessary, sufficient, or both for justification. Epistemic coherentism is distinct from the coherence theory of truth: an account of why a belief is justified need not be an account of what makes it true. (iep.utm.edu)
Coherence and mutual support
Coherence usually means more than the absence of contradiction. A collection of unrelated beliefs may be logically consistent without its members supporting one another. Coherentist accounts therefore commonly include inferential connections, probabilistic reinforcement, and explanatory relations. Deductive reasoning provides one kind of connection, but requiring every belief to follow logically from the others would exclude much ordinary empirical reasoning. Inductive reasoning allows weaker support: accepting one belief may make another more credible without guaranteeing its truth. (iep.utm.edu)
Explanatory coherentism emphasizes how beliefs explain, or are explained by, other beliefs. It connects justification with inference to the best explanation, rather than treating a belief system merely as an interconnected set of deductions. Defenders argue that justification can emerge from the explanatory organization of a system even when no individual belief supplies an independent foundation. Whether this organization generates justification, rather than merely arranging existing support, remains disputed. (tedposton.org)
As an illustration, a belief that rain has recently fallen may fit with beliefs about wet streets, clouds, and a weather report. These claims do not logically entail one another, but they can form an explanatory pattern. This illustrates the intended contrast between an organized system and a list of compatible assertions; it does not establish that coherence alone guarantees truth.
The regress problem
Coherentism is often introduced through the regress problem. If a belief requires another justified belief as its reason, that supporting belief apparently requires further justification. Foundationalism stops the regress with basic beliefs whose justification does not derive from other beliefs. Infinitism instead allows an indefinitely continuing, non-repeating structure of reasons. One interpretation of coherentism permits support to return to earlier beliefs. (iep.utm.edu)
The latter interpretation invites a charge of circular reasoning: if a disputed claim eventually serves as its own support, nothing appears to have been established. Holistic coherentists reject the assumption that justification must move along a linear chain. They maintain that justification is primarily a property of an organized system, with individual beliefs justified through their place within it. On this account, mutual support is not intended to license an argument that simply assumes its conclusion. (iep.utm.edu)
Historical development and varieties
Coherentist approaches have antecedents in British idealism and in the philosophy of science of Otto Neurath, Carl Hempel, and W. V. Quine. Influential later treatments include Laurence BonJour’s The Structure of Empirical Knowledge (1985) and Keith Lehrer’s Knowledge (1974) and Theory of Knowledge (1990). These approaches differ substantially, so coherentism denotes a family of positions rather than a single doctrine. (iep.utm.edu)
A useful distinction concerns the strength of the claim:
- Strong coherentism: coherence is both necessary and sufficient for justification.
- Necessity coherentism: justified beliefs must satisfy a coherence condition, but coherence may require supplementation.
- Sufficiency coherentism: coherence can itself generate justification, without excluding other sufficient sources.
Merely allowing coherence to strengthen independently justified beliefs does not establish strong coherentism. Foundationalist theories can also assign coherence an important supporting role. (iep.utm.edu)
Justification and truth
The coherence theory of truth identifies a proposition’s truth with its coherence with a specified set of propositions. A correspondence theory of truth, by contrast, relates truth to features of the world. The two theories answer a different question from epistemic coherentism, which concerns warranted belief. A philosopher can therefore hold that coherence justifies beliefs while their truth depends on correspondence with reality. (plato.stanford.edu)
Truth theories also face the problem of specifying the relevant system. Compatibility with an arbitrarily chosen collection is insufficient: mutually incompatible propositions may each fit different internally coherent collections. Accounts consequently differ over whether the relevant set consists of actual beliefs, beliefs at an ideal limit of inquiry, or some other privileged system. (plato.stanford.edu)
Principal objections
The isolation objection asks how relations internal to a belief system can connect it to the external world. An elaborate fiction may be internally coherent without accurately representing reality. The related alternative-systems objection asks how coherence can distinguish incompatible systems that are equally coherent. These objections challenge the claim that coherence is a reliable indicator of truth. (plato.stanford.edu)
Responses often give observational beliefs a special role. The classification then depends on what that role involves: if observations possess initial warrant independently of coherence, the resulting account may be a form of weak foundationalism rather than pure coherentism. Thus, the dispute concerns not whether experience matters, but how experience contributes epistemic support. (plato.stanford.edu)
Formal investigations also question whether greater coherence necessarily means greater truth probability. Results concerning this relationship depend on the chosen coherence measure, the credibility of information sources, and assumptions about their independence. Agreement among reports is not automatically equivalent to independent corroboration. Mathematical impossibility results constrain general claims of truth-conduciveness, but their philosophical significance depends on the assumptions of the models used. (plato.stanford.edu)
Applications and related methods
In ethics, coherentist justification is associated with reflective equilibrium: the mutual adjustment of considered judgments, principles, and relevant background theories. Wide reflective equilibrium includes critical comparison with alternative positions rather than merely making existing commitments consistent. Its relationship to coherentism depends on how the justificatory status of the starting judgments is understood. (plato.stanford.edu)
Coherence has also been modeled computationally. Paul Thagard’s constraint-satisfaction approach treats explanatory and analogical connections as positive constraints, and contradictions or competing explanations as negative constraints. An algorithm seeks a division between accepted and rejected propositions that satisfies these constraints as well as possible. Such models connect coherence theory with artificial intelligence and cognitive science, while leaving open whether successful computational organization is sufficient for epistemic justification. (arts.uwaterloo.ca)
References
- Coherentism in Epistemologyiep.utm.edu
- Coherentist Theories of Epistemic Justificationplato.stanford.edu
- Justification, Epistemiciep.utm.edu
- Beliefs are justified by coherencetedposton.org
- Epistemology, Infinitism iniep.utm.edu
- The Coherence Theory of Truthplato.stanford.edu
- Coherentist Theories of Epistemic Justification (Spring 2021 Edition)plato.stanford.edu
- Reflective Equilibriumplato.stanford.edu
- Constraint.Satisfactionarts.uwaterloo.ca