8D report example: steps, containment and corrective action
A returned batch needs immediate protection and a verified permanent correction. Follow a filled-in 8D example, including the evidence needed before containment ends.
An 8D report records an eight-discipline problem-solving response: define the problem, contain its effects, verify causes, implement a lasting correction and check that it works. Some organisations add D0 for preparation before D1 to D8.
A customer finds twelve mounting plates with holes in the wrong position. The supplier offers to inspect the next delivery. That may protect the customer for now, but the process can still make the same fault.
ASQ's 8D explanation separates interim containment from permanent correction and later effectiveness checks. The report should let someone follow that evidence, rather than simply see that eight boxes were filled in.
The 8D steps, with a filled-in report example
This fictional supplier shipped a lot of 1,000 plates. The customer identified twelve nonconforming units and returned the entire lot. Another 600 plates remain at the supplier. The investigation covers both groups.
The team inspects all 1,600 under a defined hole-position check. It finds twenty nonconforming plates in the returned lot, including the original twelve, and eight in plant stock. That is 28 nonconforming and 1,572 conforming units, not forty failures.
| Step | Entry in this example's report |
|---|---|
| D0: prepare | Protect the affected customer and define the initial trace scope |
| D1: form the team | Quality lead, process engineer, production lead and customer contact own the response |
| D2: describe the problem | Wrong hole position on the specified plate; record drawing revision, lots and unit counts |
| D3: contain | Isolate the 1,600 units, inspect them and keep the 28 failed units segregated pending disposition |
| D4: verify causes | Confirm the locating fault that produced the error and the inspection omission that let it escape |
| D5: select and verify correction | Trial the revised fixture arrangement and the required hole-position check |
| D6: implement and validate | Release the approved changes and inspect three subsequent 1,000-unit lots under the agreed trial conditions |
| D7: prevent recurrence | Update the control plan, care tasks, inspection instruction and review of similar fixtures |
| D8: close and recognise the team | Review the evidence with the agreed owners, record closure and acknowledge the team's work |
Keep the report entries short and link to the supporting records: inspection results, trace lists, trial evidence, approvals and revised instructions. Each action also needs an owner, due date and current status.
Set response deadlines through the customer agreement and the applicable quality process.
Containment vs corrective action: different jobs
Containment protects against the current problem while the cause is investigated. Here, isolation and added inspection control the affected stock. They do not repair the process that produced the wrong hole position.
Permanent corrective action addresses the verified cause. Replacing a worn locating component may form part of it, but a replacement record alone does not show that the fixture now holds position or will keep doing so.
The cost-of-quality example separates inspection and failure costs from prevention. That distinction helps explain why paying for repeated sorting is different from stopping the recurrence.
The 28 nonconforming plates remain visible in the record until their approved disposition is complete. Finding the cause does not turn those units into good stock.
Verify the occurrence cause and the escape cause
The occurrence cause explains why the fault was made. The escape cause explains why the existing controls did not stop it reaching the customer.
In this fictional investigation, the team verifies that excess movement in a locating component permits the plate to sit in the wrong position. Trial records compare the identified condition with the restored arrangement against the hole-position requirement.
The escape investigation finds a separate omission: the inspection instruction checks overall width but omits the hole's position from its reference edge. Retained failed parts pass the old width check and fail the required position check.
Those findings support two related actions. Restore and control the locating condition, and correct the inspection method. Retraining the inspector on the old instruction would leave the missing characteristic out of the check.
Use the 5 Whys example to organise a cause chain, with evidence at each link. The explanation still needs verification; a plausible diagram is not the finding.
D5 and D6: verify the proposal, then check it in use
D5 examines the proposed correction before relying on it. D6 implements the approved correction and checks its effectiveness in the operating conditions it is meant to cover.
For this case, the team agrees to check three further lots of 1,000, with the specified product, method and inspection coverage. The initial example records zero nonconforming units in each. The owners review the evidence before authorising containment removal.
Original containment scope / separate verification lots
Did the correction meet the agreed check?
The original twelve customer findings are included in the twenty found in the returned lot. Later verification is a separate population.
Later verification findings0 of 3,000Three separate 1,000-unit lots
Containment release reviewCheck metThe agreed owners can review release; this is not automatic closure
Scroll sideways for the containment and verification timing.
| Lot / check day | Units checked | Nonconforming | Stated check |
|---|---|---|---|
| V1 / day 7 | 1000 | 0 | Met |
| V2 / day 10 | 1000 | 0 | Met |
| V3 / day 14 | 1000 | 0 | Met |
Containment scope and release conditions
The returned 1,000 include the original twelve findings; inspection finds twenty in total there. Another eight are found in 600 plant units. The 28 failed original units still need their approved disposition. The later three lots total 3,000 and test the correction under the agreed product, method and inspection conditions.
The proposed day-15 review can consider ending containment if the checks pass. A failure keeps containment active and the report open. Cause verification, product disposition, updated controls and any other agreed conditions must also be complete.
Change the second verification lot to one failure. The stated check is no longer met. Containment remains active and the report stays open while the team reviews the failure and the correction.
Do not relabel that failed check as passed because the fixture was installed on time. Installation is evidence of action. The subsequent output is evidence about the result.
Close the report without losing the control
The standard work and SOP note explains where the updated method belongs. Record the applicable versions and make sure the people doing the work can use them.
D7 also asks whether the same cause can exist elsewhere. A review of similar fixtures may identify further work; one successful trial does not cover every other product.
If the team needs a short account of the wider problem and reasoning, the A3 example offers that format. The 8D record here keeps the complaint, containment and correction evidence connected.
For these plates, closure means the agreed evidence has been reviewed and the ongoing controls have owners. The aim is to make the next recurrence less likely and visible if it happens, rather than make the complaint disappear from the list.
Source and example notes
- ASQ: Eight disciplines (8D). D0 preparation, the eight disciplines, occurrence and escape causes, correction and effectiveness.
All products, causes, counts, trial results and timing are fictional. The three-lot check was chosen for this example, not as a required sample size for every correction.