PFMEA in APQP

Process Failure Mode and Effects Analysis (PFMEA) is a structured team analysis of how a manufacturing or assembly process can fail to produce a product that meets requirements. Build it from the actual process flow, not from a generic list of failures.

One process step at a time

Process function

Define what the step must accomplish—for example, apply a specified torque, install the correct component, or create a defined feature.

Failure, effect, and cause

Describe how the step could fail, the effect of that failure, and the specific process cause or mechanism. “Operator error” alone is not a usable cause.

Controls and action

Identify current prevention and detection controls, then take action where the analysis shows risk that must be reduced. Transfer executable controls to the control plan.

Keep the PFMEA useful

Use the same step numbers and names as the process flow diagram.
Have people who run, set up, maintain, inspect, and troubleshoot the process participate. Their practical knowledge exposes weak assumptions.
Differentiate prevention controls from detection controls, and do not claim a control that has not been implemented or verified.
Use the organization’s approved FMEA method and customer-specific requirements for ratings, action priority, and documentation.
When a process or control changes, review the related PFMEA, control plan, work instructions, training, and validation evidence.

Time-saving tip: write the control plan directly from the approved PFMEA controls, then review the two documents side by side. Every critical process control should be traceable to a risk or requirement; every PFMEA control should be executable at the point of use.

Next: convert the selected controls into a usable Control Plan.