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pdca-improvement

Run a PDCA cycle, Plan Do Check Act improvement cycle, or structured improvement project. Guides through problem analysis, piloting, verification, and standardisation. Distinguished from 8D: PDCA is for proactive improvement initiatives, 8D is for reactive defect response. Use for process optimisation, lessons learned implementation, and quality objectives.

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# PDCA Improvement Cycle

## When to use

Use PDCA for:
- Continuous improvement initiatives (not problem reactions — use 8D for that)
- Implementing a process optimisation with uncertain outcome
- Piloting a change before full deployment
- Structured improvement from lessons learned or audit findings
- Meeting a quality objective that requires a new approach

**Key distinction from 8D:** PDCA is proactive or slow-burn improvement. 8D is reactive to a specific defect or failure. Both use root cause analysis, but PDCA has a broader scope and a pilot step before full deployment.

**When PDCA is used for corrective action** (e.g., responding to an audit finding or recurring NC): a [Corrective Action Request (CAR)](../../documentation/car-corrective-action/) must also be opened to document root cause, actions, and VOE per ISO 9001 §10.2. PDCA is the improvement methodology; the CAR is the governance record.