QAPP CI · AIAG 8-D SUPPORTING TOOL
Ishikawa / Fishbone
Organise cause hypotheses into categories to widen the investigation, then require evidence to validate each hypothesis.
Data and preparation
Problem statement, cross-functional team, relevant categories, hypotheses and evidence
Practical workflow
- Write the effect/problem in verifiable terms.
- Choose categories suited to the process; 6M is only a starting point.
- Generate hypotheses without confusing them with demonstrated causes.
- Prioritise testable hypotheses.
- Validate or reject hypotheses using data and update the analysis.
What QAPP records
| Problem / baseline | Analysis / action | Verification |
|---|---|---|
| Facts, scope, evidence and context | Hypotheses, causes, owner, action and due date | Result, effectiveness, lessons learned and standard update |
Connection to AIAG
AIAG’s 8-D training explicitly includes fishbone cause-and-effect diagrams among the problem-solving techniques. QAPP uses the tool to generate/test causes inside an evidence-based workflow.
Open official source →Common trap
The diagram or question sequence is not the result. A cause becomes credible only when it is supported by evidence and the corrective action changes the predicted mechanism.