PPAP Control Plan Assessment: Controls, Frequencies and Reaction Plans

01How to use this chapter

This chapter separates the uploaded assessment criteria from practical KEVOS implementation guidance. The section titled Source-derived assessment criteria preserves the intent, terminology and checklist detail supplied in the uploaded PPAP Assessment. The surrounding handbook guidance explains how a manufacturing or supplier-quality team can organise evidence, perform a readiness review and spot gaps before formal submission. Where the uploaded source states a numeric threshold, edition reference or customer-specific expectation, it is identified as source-derived rather than presented as a universal rule.

Use the chapter in three passes. First, read the purpose and workflow to understand what the element is meant to prove. Second, work through the source-derived prompts against the actual part number, engineering revision and production process. Third, close the red flags and collect objective evidence before the package is released. For large PPAPs, record the evidence location beside each source prompt so another reviewer can repeat the assessment without relying on verbal explanation.

02Handbook workflow

1. Build from APQP evidence, not from a blank templateUse DFMEA/PFMEA, process flow, capability results, engineering tests and customer concerns to decide what needs control.
2. Cover the whole product routeInclude receiving, processing, assembly, inspection, testing, packaging and shipment, plus subcontract and alternate operations where applicable.
3. Define each control completelyState the characteristic, specification, method, gage/equipment, sample size/frequency, responsible person and referenced work instruction.
4. Make special-characteristic controls explicitIdentify special required/design/process characteristics and the approved statistical or other control method.
5. Write practical reaction plansDefine product containment, process response, escalation and corrective-action path for nonconformance or out-of-control conditions.
6. Control the control planMaintain part number, engineering change, original/version date, approvals and document-control status.
7. Keep it aliveUpdate when processes change, new products/design changes are introduced, or customer problems/rejections reveal a control gap.

03Evidence package to retain

The assessment is stronger when each conclusion points to a controlled record rather than a statement that the requirement is “covered”. The following evidence set is a practical minimum for this chapter; actual customer and contractual requirements govern the live submission.

• Controlled production control plan with correct part/revision
• Cross-functional approval/participation evidence
• Process-step match to flow chart and PFMEA
• Incoming, in-process and final controls
• Special-characteristic identification and control method
• Inspection gage/technique/equipment identification
• Sampling and test-frequency rationale
• Reaction plans for nonconforming product/out-of-control process
• Referenced setup/process/inspection/operator instructions
• Alternate/backup and subcontract control plans
• Traceability/calibration expectations for gaging
• Update history after process/customer changes

04Source-derived assessment criteria

• 1.Detailed and complete Process Control plans shall be in place to purchase, manufacture, inspect, test, assemble, package, and ship product for each operation performed.
• 2.Control Plans and input criteria shall be reviewed with Organization personnel.
• 3.Evidence that the Process Control Plan is a working document, including NPI products.
• 4.The Control Plan shall provide detail methods of handling nonconforming products and corrective action program on all quality problems including attribute variables.
• 5.All print, specification, attribute, purchase order requirements, etc. shall be identified on the Control Plan.
• 6.Is a Production Control Plan per AIAG APQP& Control Plan (manual) requirements?
• 7.Are all sections filled out including evidence of cross-functional team involvement?
• 8.Is the right part number and current engineering change identified?
• 9.Is the original and version date noted?
• 10.Is the document controlled?
• 11.Are Control Plan processes keyed to Process Flow Chart, PFMEA and other APQP documents?
• 12.Is Receiving Inspection, Process Inspection, and Final Inspection included in CP?
• 13.Are Special Characteristics from DFMEA and PFMEA identified on the Control Plan?
• 14.Are Performance Testing requirements identified and are they at the proper intervals?
• 15.Is all manufacturing equipment identified i.e. press type, paint booth type, etc?
• 16.Is the control method for Special Characteristics identified (e.g. x-chart,.)?
• 17.Are all inspection gages, techniques, and equipment identified?
• 18.Are appropriate reaction plans included in the Control Plan?
• 19.Is the Control Plan available in English or translated?
• 20.Have all known customer concerns been identified to facilitate the selection of Special Required/Design/Process Characteristics?
• 21.Are all Special Required/Design/Process Characteristics included in Control Plan?
• 22.Were SFMEA, DFMEA and PFMEA used to prepare Control Plan?
• 23.Are material specification requiring inspection identified?
• 24.Does the Control Plan address incoming (material/components) through process/assembly including packaging?
• 25.Are Engineering Test and Performance requirements identified?
• 26.Is there evidence of a team developed Control Plan?
• 27.If a supplier references a procedure, Work Instructions, specification, etc. for control, a copy shall be provided.
• 28.Is there evidence for control of attributes and other non-print requirements?
• 29.Are there Process Control Plans in place for all Organization part numbers?
• 30.Is there a Process Control Plan for each manufacturing operation?
• 31.What methodology was utilized in preparing the Control Plans?
• 32.Were DFMEA’s, PFMEA’s, Flow Chart, Initial Capability and other APQP documents used in the construction of the Control Plan?
• 33.Is there a documented program for establishing sample sizes and test frequencies?
• 34.Does the Control Plan state in detail specific data such as progress step (Flow Chart), process description, Organization part number, and individual responsible for plan, date and revision?
• 35.Are Special Characteristics and other major, significant, features of special interest, etc. process variables identified?
• 36.Does the Control Plan provide detail on: machine make & model, machine type, machine number/identification, etc.?
• 37.Does the plan contain reference support documents such as setup, process, inspection and operator instructions?
• 38.Are Control Plans completed and readily available for alternate or backup process?
• 39.Do Control Plans include all attribute characteristics?
• 40.Does the Control Plan include specific controls for assembling and packaging product?
• 41.Are Process Control Plans prepared for sub-contract supplier’s products and services?
• 42.Are specification/requirements communication to the sub-contract suppliers?
• 43.Is there evidence that the plan is effective and is a living document?
• 44.Does the plan provide a method for handling nonconforming products?
• 45.Does the plan provide a method for correcting out of control processes?
• 46.Is the Control Plan updated when process changes are made?
• 47.Is there evidence of feedback from customer problems or rejections?
• 48.Are Process Control Plans completed/updated for new product or design changes?
• 49.Are Engineering Test and Performance requirements identified?
• 50.Are gage methods compatible and are they traceable to national standards? Additionally, a natural extension / cascade to the Control Plan should be a review of Operator / Process instructions.

05Common red flags

These are practical review signals derived from the relationships and controls repeatedly required by the source. A red flag does not automatically mean the submission must be rejected; it means the condition deserves documented resolution before approval.

• Control plan lists characteristics but not reaction plans
• Sampling frequency is copied from another product without rationale
• Machine/equipment identification is too generic to reproduce the approved process
• Control plan omits incoming, packaging or subcontract controls
• Referenced procedures are unavailable to operators or absent from the submission
• Special-characteristic method is not defined
• Control plan does not change after a process change or customer rejection
• The plan exists for PPAP but is not used on the shop floor

06Cross-document interfaces

PPAP elements should not be reviewed as isolated files. Check the following interfaces for consistent part identity, revision, characteristic naming, operation numbering and control logic.

07Assessor close-out checklist

• The element is present or a controlled waiver/agreement explains why it is not required.
• The submitted record identifies the correct part number and engineering revision where applicable.
• The evidence is legible, understandable, controlled and traceable to the submitted product/process.
• Special characteristics and known customer concerns are treated consistently across related documents.
• Any nonconformance, temporary control, deviation or interim condition is visible and formally dispositioned.
• Actions have owners, due dates and objective closure evidence where the source expects corrective action.
• The final conclusion can be independently repeated by another reviewer using the package alone.

08Frequently asked questions

09Source and limitations

Primary source: uploaded Production Part Approval Process (PPAP) Assessment / PPAP Submission Assessment, 15 pages, Quality-One. Source sections used on this page: 2.2.7 Control Plan. Approximate source page coverage: 6-8.

This KEVOS chapter is an educational and assessment aid. It preserves the uploaded document's criteria but does not replace controlled customer-specific requirements, engineering specifications, contractual requirements or an official PPAP/APQP manual. Where the source references “PPAP 4th edition”, AIAG methods, Organization systems or Organization-specific targets, those references are retained as source context rather than silently updated or generalized.