# Root Cause Worksheet — v1.0.0

Reviewed: 2026-07-15
Owner: Quality Engineering

## Purpose
Structure root-cause analysis so occurrence, escape and systemic causes are each identified with evidence, not opinion.

## Required fields
- `capaId`
- `problemStatement` — measurable, time-bounded
- `occurrenceCause` — why the defect was produced
- `escapeCause` — why it was not detected
- `systemicCause` — why the management system allowed it
- `evidenceRefs` — data, images, sample IDs supporting each cause

## Discipline
Do not accept "operator error" as a terminal cause. Continue the Five Whys until a controllable system factor is reached.

## Change history
- v1.0.0 — initial release.