PDCA Improvement Cycle
Plan an improvement hypothesis, record execution, compare actual results with the target and decide what to standardise or revise.
Purpose and method
Manage improvement as a controlled Plan–Do–Check–Act cycle with evidence and follow-up actions.
When to use it
Use PDCA when a change must be tested, measured, evaluated and either standardized or corrected.
Core principle
PDCA separates prediction from evidence. The Check phase tests whether the intervention caused the expected result before the change becomes a standard.
What the interactive module provides
- PDCA action board
- Verification criteria
- Follow-up decisions
- PDCA record, action status, target comparison and Act decision
Professional verification: The module supports learning, analysis and documentation. Verify results against actual process conditions, internal standards, safety requirements and competent professional judgement before implementation.
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Recommended workflow
Plan an improvement hypothesis, record execution, compare actual results with the target and decide what to standardise or revise.
- 1
Plan the problem, baseline, target and hypothesis
- 2
Do the smallest safe trial and record deviations
- 3
Check data against the expected result
- 4
Act by standardising, adapting or abandoning the change
- 5
Start the next cycle from the remaining gap
02
Practical example
A team expects a new material route to reduce walking from 420 to 250 metres per shift. The trial reaches 265 metres, reveals one obstruction and is revised before standardisation.
Calculation or verification principle
Check the gap explicitly: result gap = actual result − target. Record baseline, target, actual result and observation period.
Required inputs → Expected outputs
- Required inputs
- problem, baseline, target, hypothesis, actions, owner, due date and measured result
- Expected outputs
- PDCA record, action status, target comparison and Act decision
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Common mistakes to avoid
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Starting with actions before defining a target
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Treating Do as full rollout rather than a test
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Checking opinions instead of agreed evidence
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Standardising despite an unverified result
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Frequently asked questions
What data do I need to use this tool?
Prepare problem, baseline, target, hypothesis, actions, owner, due date and measured result.
What result does the module produce?
The module produces PDCA record, action status, target comparison and Act decision.
Can I implement the result without further review?
No. Treat the output as a structured engineering and improvement aid. Verify source data, assumptions, safety, quality, legal requirements and local process conditions with competent responsible people before implementation.
LEAN Toolbox
Open interactive tool →PDCA Improvement Cycle
Plan an improvement hypothesis, record execution, compare actual results with the target and decide what to standardise or revise.