P
Perspective
- Whose view is this? Who benefits? Who is missing?
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Methodology
PERCH
Professional Evidence & Reasoning Critical Heuristic.
PERCH is a structured reasoning framework for evaluating claims, research outputs, AI-generated content, and business recommendations before making decisions.
PERCH scorecard
Perspective★★★★★
Evidence★★★★★
Reasoning★★★★★
Context★★★★★
Hypotheses★★★★★
Purpose
- Strengthen reasoning before trusting a claim.
- Expose missing perspectives, weak evidence, and bad logic.
- Create a disciplined review path for AI output.
When to use
- Researching competitors or markets.
- Reviewing AI-generated reports or recommendations.
- Making decisions that depend on evidence quality.
When not to use
- Simple factual questions.
- Basic calculations.
- Grammar correction or simple drafting.
Decision tree
Use PERCH when the question is not just ‘what does the AI say?’ but ‘should we trust this?’
- If the evidence is weak, slow down.
- If the reasoning is thin, test the logic.
- If context changes the meaning, revise the conclusion.
Process
E
Evidence
- What evidence supports the claim, and how reliable is it?
R
Reasoning / Representativeness
- Does the logic follow? Is the evidence representative or cherry-picked?
C
Context
- What market, regulatory, operational, or historical context changes the meaning?
H
Hypotheses
- What alternative explanations or competing interpretations weaken the conclusion?
AI prompts
Prompt 1
Run a PERCH review on this claim. Identify missing perspectives, evidence gaps, logic problems, context shifts, and competing hypotheses.
Prompt 2
For each claim, state the confidence level and the type of source that would be needed to verify it.
Examples
Example
‘Revenue increased 40% because of AI.’ PERCH asks for audited figures, checks whether market growth explains the change, and tests the causal claim.
Common mistakes
- Accepting the first convincing answer.
- Ignoring incentives and perspective.
- Treating one source as enough.
Downloadable checklist
- Perspective mapped.
- Evidence checked.
- Reasoning tested.
- Context reviewed.
- Hypotheses considered.