An epistemological view that grounds the epistemic justification of a belief in the reliability of the cognitive process that produced it: a belief is justified (or epistemically warranted) when it reliably yields true beliefs across relevant circumstances, regardless of the subject's reflective access to justificatory reasons.

Principle

Epistemic justification depends on the objective reliability of belief-forming processes rather than the believer's internal access to reasons; reliability is assessed across a set of relevant circumstances or background conditions.

Demonstration

Illustrative scenario — Situation: An agent forms the belief ‘there is a tree outside’ by normal visual perception on a clear day. Recognition: The perceptual process is known to yield true beliefs under these circumstances with high probability. Action: The agent treats the belief as epistemically justified and acts (e.g., steps outside expecting a tree). Consequence: Because the perceptual process is reliable in those conditions, the belief counts as justified even if the agent cannot articulate recovery conditions or philosophical reasons.

Misapplication

Mistakenly treating any single true belief produced by a normally reliable process as automatically knowledge without considering whether the process is in fact reliable in the relevant circumstances; the error is conflating isolated truth with process-level reliability.

Consequence

Shifts epistemic assessment from internal access to external performance: justification and many epistemic evaluations depend on characterizing processes and their success rates across circumstances, which affects what evidence, testimony, or perception count as justificatory in practice.

Reversal

When epistemic norms require reflective access, reasons-based responsibility, or justificatory transparency (for example in moral or legal contexts demanding justificatory reasons), reliabilist external criteria may be insufficient and internalist standards can override or supplement reliability.

Boundary

Applies to assessments of justification for empirical and belief-forming processes; it does not itself equate reliability with truth in every single instance nor does it by itself define epistemic concepts like knowledge that include additional conditions (e.g., truth). It excludes purely internalist accounts that require reflective access to justifying reasons.

Semantic Tension

Externalism ↔ Internalism: reliabilism (external reliability criteria) competes with internalist views that demand access to justificatory reasons, creating tension over what counts as legitimate epistemic justification.

Synthesis

Reliabilism separates the normativity of justification from the subject's introspective access: epistemic warrant is characteristically a function of the causal or statistical success of processes across relevant conditions, while demands for justificatory reasons reflect a distinct normative concern (responsibility, explainability).