|5W's / 2 How's / Timeline
KISS answer (keep it short and simple)
for investigation of defect: Why made and why not detected?
What is the problem in terms the company understands What else could be a problem & it isn’t?
Where found/where on part/where w/in process
Where else could it be a problem?
Where else could it be a problem & it isn’t?
When is it occurring? When did it start? (identify all units and determine scrap, rework, send customer notice?)
When is the problem not present and could be?
Why was it not identified immediately?
How many? include historic data, trends, etc.
How identified: Could it have been identified earlier (missed detection point)?
To Whom (risk thinking):
Timeline & Changes: problem from start? Gradual change? Abrupt Change?