PPAP gets a bad reputation.
To some teams, it feels like a giant paperwork exercise: dimensional results, material records, process flows, control plans, FMEAs, capability studies, approvals, submissions, signatures.
But PPAP is not paperwork for paperwork's sake. It is how suppliers prove they can meet customer requirements under actual production conditions. AIAG lists PPAP as one of the automotive Core Tools, alongside APQP, Control Plan, FMEA, MSA, and SPC.
At its best, PPAP answers a simple customer question:
Can we trust this process to make this part correctly, repeatedly, and at volume?
That is why weak PPAP discipline creates so much downstream pain. If the process flow does not match reality, the control plan is outdated, measurement systems are unproven, or capability data is incomplete, the customer is being asked to accept uncertainty.
Manufacturers should treat PPAP as a living evidence package, not a one-time submission. Engineering changes, process changes, supplier changes, tooling changes, and customer requirement changes can all trigger the need to revisit the evidence.
What manufacturers should pay attention to:
PPAP should be connected to real production data, current process controls, and approved customer requirements.
Bottom line: PPAP is not just a form. It is proof that the manufacturer is ready to perform.