Build APQP and PPAP documents that work together
These guides explain a practical order for completing the core records. Start with the customer’s current requirements, drawings, specifications, and submission instructions. They define which documents, formats, approvals, and PPAP evidence your program actually requires.
Phase 1
1. APQP plan
An APQP plan is the project’s quality roadmap. It should show every required deliverable, the accountable owner, the due date, input dependencies, and the approval or review required to close it.
- Collect controlled inputs. List the customer requirements, drawings, specifications, quotations, feasibility commitments, supplier requirements, and internal launch requirements. Record the revision and source of each input.
- Define the scope. State the part, manufacturing site, program, customer, key suppliers, and planned production process. Identify what is new or changed.
- Build the deliverable schedule. Add APQP phases, risk analyses, validation events, customer submissions, and gate reviews. Put tests and trials early enough to allow corrective action.
- Assign accountability. Give each item one accountable owner; name contributors separately. Track open issues, decisions, and escalations to closure.
- Review at defined gates. Confirm readiness using evidence—not a percentage complete. An item is not complete until its acceptance criteria and approvals are met.
Process design
2. Process flow diagram
The process flow diagram is the single sequence of how material and product move through the real process. It is the backbone for the PFMEA and control plan.
- Walk the process. Trace material from receiving through shipment with operators, quality, maintenance, logistics, and supervisors.
- Map every meaningful step. Include outsourced operations, inspection and test, transfers, storage, rework loops, and nonconforming-material routes where applicable.
- Give each step a stable number and name. Reuse those identifiers in the PFMEA, control plan, work instructions, and related records.
- Show inputs and outputs. Identify what enters and leaves each step, including information such as the job traveler or program.
- Approve against reality. Review the flow with the cross-functional team, then update it whenever the manufacturing route changes.
Product design
3. Design FMEA (DFMEA)
A DFMEA examines how the product design could fail to perform its intended function. It is owned by the design-responsible organization; manufacturing and supplier expertise are essential inputs.
- Define the design scope and structure. Identify the system, subsystem, component, interfaces, requirements, and operating conditions being analyzed.
- State each function clearly. Describe what the design must do, its performance requirement, and the operating condition. Do not start with a generic failure list.
- Analyze failure chains. For each function, identify the failure mode, its effect, and the specific design cause or mechanism.
- Evaluate risk using the approved method. Use the rating, action-priority, or other method required by your organization and customer. Record the basis for each assessment.
- Act and communicate. Reduce risk through design actions, verify the result, and pass relevant characteristics and residual risks to process development.
Process design
4. Process FMEA (PFMEA)
A PFMEA examines how the manufacturing process could fail to make a conforming product. Build it from the approved process flow, with the people who run and support that process.
- Set the analysis boundary. Confirm the product, process flow revision, plant, equipment, and process steps included in the analysis.
- Define the function of each step. State what the step must achieve, such as “install the correct seal to the specified depth.”
- Identify credible failure chains. Define the failure mode, effect, and specific cause. “Operator error” is not specific enough to control.
- Separate prevention from detection. A prevention control stops or reduces the cause; a detection control identifies a problem after it can occur. Document what is actually in place.
- Prioritize and close actions. Use the approved FMEA method, add effective actions, and transfer the implemented controls to the control plan.
Production control
5. Control plan
A control plan makes process control executable. It tells the production team what to control, how to verify it, how often, who is responsible, what record is needed, and how to react when the result is not acceptable.
- Start with requirements and PFMEA outputs. Include product and process characteristics that need control because of customer requirements, risk analysis, regulations, or internal requirements.
- Match the process flow. Use the same process steps and sequence as the flow diagram. Do not create a control-plan step that does not exist in the process.
- Specify the method. Define the requirement, target or specification, measurement or monitoring method, sample size or frequency, responsible role, and record.
- Write a usable reaction plan. State how to stop or contain the condition, identify affected product, notify responsible roles, correct the issue, and verify release or restart.
- Validate at the point of use. Confirm gauges, fixtures, instructions, training, records, and response authority exist where the control will be performed.
Validation support
6. Measurement system analysis (MSA)
MSA determines whether a measurement system is suitable for its intended use. A measurement system includes the gauge or test equipment, method, fixture, software, part, environment, and people using it.
- Define the measurement decision. Identify the characteristic, tolerance or acceptance decision, method, and users.
- Choose the study that fits the risk. Common studies address bias, linearity, stability, repeatability, reproducibility, or attribute agreement. Use the method required by the customer or your internal procedure.
- Use representative parts and conditions. Select parts that represent the process variation and have appraisers follow the normal method.
- Analyze against the acceptance criteria. Use the specified criteria, not an assumed pass/fail rule. Record limitations or improvement actions.
- Implement and recheck improvements. Improve the method, fixture, training, environment, or equipment as needed before relying on the measurement for product acceptance or capability evidence.
Process validation
7. Initial process capability or performance study
A capability or performance study evaluates whether a stable, production-representative process can meet a characteristic’s requirements. The customer or internal procedure defines the applicable study, index, sampling, and acceptance criteria.
- Confirm readiness first. Use the intended equipment, tooling, people, material, method, gauges, and production conditions.
- Verify the measurement system. Do not draw a capability conclusion from a measurement system that has not been assessed for its intended use.
- Collect traceable data. Record characteristic, specification, date, process conditions, lot or run, measurement system, and any special cause.
- Check stability before interpreting capability. Investigate unusual variation or non-random patterns according to the applicable statistical method.
- Report the result and act. Compare the result with the required acceptance criterion, document containment or improvement when needed, and retain the evidence requested for PPAP.
Customer submission
8. PPAP package and Part Submission Warrant (PSW)
PPAP demonstrates that the supplier understands customer requirements and that the production process can consistently produce conforming product. The customer specifies the submission level and required evidence; never assume every PPAP element applies.
- Read the submission request. Confirm part number, revision, reason for submission, submission level, due date, customer format, and any customer-specific evidence.
- Build an evidence matrix. List each requested item, owner, source record, revision, approval status, and final file location. Typical evidence may include design records, authorized engineering changes, process flow, FMEAs, control plan, dimensional results, material or performance results, MSA, capability studies, appearance approval where applicable, and the PSW.
- Verify production representativeness. Confirm the submitted parts and results came from the conditions the customer requires for the PPAP run.
- Perform a cross-document review. Confirm the drawing, process flow, PFMEA, control plan, work instructions, gauges, test methods, and results refer to the same product and current revisions.
- Complete the PSW truthfully. The authorized signer certifies the submission status. Resolve discrepancies or obtain the required customer disposition before representing the submission as approved.
- Submit, retain, and control change. Follow the customer’s portal or submission method, retain required records, and evaluate future changes against customer PPAP notification and resubmission requirements.
Field-by-field PPAP deliverable guides
Open the guide that matches each deliverable requested by your customer. These links cover the standard PPAP evidence types; applicability, submission level, form, and acceptance criteria remain customer-defined.
APQP 3rd Edition was published by AIAG in 2024; AIAG also publishes a standalone Control Plan manual. This page is practical guidance, not a substitute for current customer-specific requirements or licensed industry publications.