Do an 8D when:
You do not know the cause or causes of the problem
It's a repeat problem (perhaps previous attempts at solving it have failed)
It's a serious problem (e.g. high cost, safety issue, etc.)
It affects subsequent or dependent operations
It's hard to define
There is disagreement regarding the problem and/or solution
Don't do an 8D if:
It's a small, isolated non-conformance that's easily fixed with no likelihood of repeating
The cost of performing the solution exceeds any possible future problems due to not solving it
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