Retrospective Validation

Validate whether a methodology, process, or technical approach actually worked by analyzing historical evidence. Uses past validation results, deployment outcomes, and incident history to assess effectiveness.

When to Use

• After a sprint/milestone to evaluate the validation approach used
• When deciding whether to continue or change a methodology
• When comparing two approaches (A/B validation strategy)
• Post-incident to assess if validation should have caught the issue
• When building a case for adopting or abandoning a practice

Four-Phase Process

Phase 1: COLLECT     Phase 2: ANALYZE      Phase 3: CORRELATE    Phase 4: CONCLUDE
Historical           Categorize &          Map causes to         Confidence score
evidence             quantify outcomes     effects               & recommendations