STAGE 1: Define acceptable work
Concept: Quality criteria must describe a verifiable requirement.
Task: Create acceptance checks for page count, binding and labeling.
Acceptance: Identify the unit inspected and the evidence retained.

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STAGE 2: Record defects reliably
Concept: Defect counts and defective-unit counts are different measures.
Task: Build a defect log with category, unit ID and detection stage.
Acceptance: Do not infer the defective-unit rate without the number of inspected units.

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STAGE 3: Prioritize investigation
Concept: A Pareto chart prioritizes reported categories, not proven root causes.
Task: Rank the supplied categories and select one for a cause investigation.
Acceptance: Use a cause hypothesis with a test rather than declaring a cause from frequency alone.

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STAGE 4: Verify corrective action
Concept: Closing an action is not the same as demonstrating effectiveness.
Task: Propose a process change, owner and follow-up sample plan.
Acceptance: State what result would cause the action to reopen.

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