8D report: the eight disciplines of problem solving
8D (eight disciplines) is a structured, team-based problem-solving method used in automotive and many other industries to handle customer complaints and internal quality problems. The 8D report is both a way of working and a document: it shows the customer that the problem has been contained, the root cause found, and the fix is permanent.
The steps
| Step | Content |
|---|---|
| D0 – Prepare | assess the problem and whether 8D is needed; emergency response actions |
| D1 – Team | a small cross-functional team with a leader and a sponsor |
| D2 – Problem description | precise, measurable description: what, where, when, how many; 5W2H, is / is-not analysis |
| D3 – Interim containment | protect the customer: sorting, quarantine, stock checks, verification of effectiveness |
| D4 – Root cause | identify and verify the occurrence and escape root causes (5 Whys, Ishikawa diagram, data analysis) |
| D5 – Permanent corrective action | choose and verify the action that removes the root cause before implementing it |
| D6 – Implement and validate | implement the corrective action, remove containment, and prove effectiveness with data |
| D7 – Prevent recurrence | fix the system: FMEA, control plan, work instructions, similar products and processes |
| D8 – Close and recognise | recognise the team, close the report and share lessons learned |
Good practice
- Look for two root causes: why the defect was made (occurrence) and why it was not detected (escape).
- Verify the root cause: you should be able to switch the problem on and off by introducing and removing the cause.
- Adding inspection is rarely a permanent fix on its own; aim for actions that prevent the defect (for example poka-yoke).
- Deadlines are customer-specific; a common expectation is containment within 24 hours, root cause and corrective action within 10 working days, and closure once effectiveness is verified.
- Feed lessons learned back into the FMEA and the control plan.