Nyaya Epistemology (Four Valid Means of Knowledge)

The Nyaya school identifies four pramanas (valid knowledge sources): Pratyaksha (direct perception), Anumana (inference from evidence), Upamana (comparison/analogy), and Shabda (testimony of reliable authorities). Each has specific validity conditions and failure modes. Perception can be distorted by emotional states. Inference can fail through faulty premises. Analogy misleads when comparisons are inappropriate. Testimony fails when authority is unreliable or speaking outside competence. Nyaya philosophers analyzed each failure mode, creating a systematic practical epistemology.

When to use it

When evaluating information reliability before deciding. When knowledge sources conflict and you need to assess which is more trustworthy. When auditing reasoning to identify over-relied-upon sources. When building research processes ensuring multiple valid sources.

How it can help

A diagnostic for evaluating any knowledge claim: What is the source? Direct observation, logical inference, analogy, or authority? Each has different reliability. Knowledge workers: 'Am I relying on observation, inference, analogy, or authority? Is that source reliable for THIS claim?' For market research: direct customer observation (pratyaksha) is often more reliable than reports (shabda), but inference (anumana) is necessary for prediction. The failure mode analysis is especially valuable.