“The real test of a Control Plan is not whether it is approved, but whether it prevents problems and protects the customer.”
Introduction
You may have read How to Win Friends and Influence People many times and even speak about it. But if criticism or rude behaviour immediately makes you defensive and angry, have you truly understood the book, or merely read it without applying its lessons?
Objective and Significance
To highlight how top management can improve quality, delivery, and customer satisfaction by treating the Control Plan as a living business tool and ensuring its effective execution through adequate resources, accountability, and continuous updates.
Read More: https://bit.ly/PPAP2Mistakes (2 Key Mistakes in PPAP Process)
Read More: https://bit.ly/APQP2Mistakes (2 Key Mistakes in APQP Process)
Definition: IATF 16949
APQP (Advance Product Quality Planning): product quality planning process that supports development of a product or service that will satisfy customer requirements; APQP serves as a guide in the development process and also a standard way to share results between organisations and their customers; APQP covers design robustness, design testing and specification compliance, production process design, quality inspection standards, process capability, production capacity, product packaging, product testing and operator training plan, among other items.
Control Plan: Documented description of the systems and processes required for controlling the manufacturing of product
Read More: https://youtu.be/eBP7noTTOeo (Control of NC Products)
A Control Plan is a structured method for managing manufacturing processes to ensure that products consistently meet customer requirements. It defines what must be controlled, how it will be controlled, who is responsible, and what actions are required when deviations occur.
A good Control Plan is not merely a quality document. It is a business tool that helps an organisation achieve its objectives related to quality, delivery, cost, compliance, and customer satisfaction.
Here are the two biggest mistakes that are common across the automotive industry.
Read More: https://youtu.be/2e4ubL8eHns (KAIZEN)
Read More: https://bit.ly/JobSetUpvsFPI (Difference Between FPI and Job Setup)
Mistake 1: Treating the Control Plan as a PPAP or Compliance Document
One of the most common mistakes made by organisations is treating the Control Plan as a document required only for customer approval, audits, or PPAP submission.
Once approved, the document often remains unchanged while products, processes, equipment, materials, and customer requirements continue to evolve.
As a result, the Control Plan no longer reflects the actual manufacturing process.
Why this is an issue
When the Control Plan is not maintained as a living document:
- New process risks remain unidentified.
- Lessons learned from defects are not incorporated.
- Changes in products, equipment, tooling, or inspection methods are not captured.
- Operators follow practices that differ from documented standards.
- Audit compliance may exist, but process control does not.
Business Impact
- Increased internal rejections and rework.
- Higher cost of poor quality.
- Customer complaints and warranty
- Production disruptions.
- Reduced customer confidence.
Read More: https://youtu.be/sPtwvL1igLE (Final Inspection)
What Top Management Should Ask
“When was the Control Plan last updated following a product, process, supplier, or customer change?”
“How do we ensure that lessons learned from quality issues are incorporated into our Control Plans?”
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Mistake 2: Failing to Provide the Resources, Authority, and Accountability Needed for Execution
Even a well-written Control Plan has no value unless it is consistently executed on the shop floor.
Many organisations create detailed Control Plans but fail to provide the resources required to implement them effectively.
Common Examples
- Inadequate measuring
- Lack of calibration and maintenance.
- Insufficient operator and inspector training.
- Missing mistake-proofing (Poka-Yoke) systems.
- Shortage of qualified
- Process checks skipped to meet production targets.
- Unclear ownership of control plan compliance.
Read More: https://bit.ly/SPCvsMSA (Difference SPC and MSA)
Example: Moulding Process
| As per Control Plan | What Management must provide |
| 200T moulding machine | Capacity and maintenance |
| Jigs and fixtures | Design and investment budget |
| Welding Level 2 operators | Training, certification, manpower planning |
| Poka-Yoke | Engineering time and capital |
| Abnormality handling | Authority for operators to stop the line, with no penalty for doing so |
| CMM and other test equipment | Purchase, calibration and MSA |
Why this is an issue
Execution failures are rarely caused by frontline employees alone. They are usually symptoms of insufficient leadership focus, resource allocation, or accountability.
When production output is prioritised over process discipline, defects eventually reach the customer.
Business Impact
- Customer line
- Quality spills and containment actions.
- Increased inspection costs.
- Escalations from customers.
- Loss of future business opportunities.
- Reputational
Read More: https://youtu.be/Zi7UzM59Muw (Reaction Plan)
What Top Management Should Ask
“Do we have the people, equipment, training, and systems required to execute every control defined in the Control Plan?”
“How do we verify that critical controls are actually being followed every day?”
Read More: https://youtu.be/ZNlr1yEpVbw (SMED)
Conclusion
A Control Plan should not be viewed as a quality department document. It is a management system for protecting customer satisfaction, operational performance, and business profitability.
The two biggest mistakes are:
- Treating the Control Plan as a static compliance document rather than a living business tool.
- Failing to provide the resources, authority, and accountability required for effective execution.
When these two mistakes are avoided, the Control Plan becomes a powerful mechanism for preventing defects, reducing costs, ensuring delivery performance, and improving customer trust.
“Top management should remember that customers do not buy Control Plans; they buy consistent quality, reliable delivery, and confidence in your processes. A Control Plan creates that confidence only when it is continuously updated and rigorously executed.”
Read More: https://youtu.be/pJ2Pg6UH6RI (4M Change)
References:
IATF 16949
APQP Manual
PPAP Manual
Control Plan Manual
Industry Experts
This is the 263rd article in my Quality Management series. Each weekend, I share practical insights designed to make your Management System journey more effective, efficient, and meaningful. If you find this useful, please share it with your colleagues as well.
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