Don't Blame the Operator for a Process You Haven't Brought Under Control

Seven Principles for Extrusion Process Improvement, Control and Management

Production managers and supervisors get frustrated with operators while remaining completely oblivious to the poor state of the process itself. No documented standards. Insufficient training. Inconsistent measurements. Drifting equipment. Inadequate raw material control. Then they wonder why quality varies shift to shift and day to day.

The process owns the output. Not the operator. Great operators can't save a broken process. But a solid process makes everyone look good and the days more profitable.

These seven steps form a continuous improvement cycle, starting with the recognition that it's the process—not the operator—that drives output. Maintenance of current performance naturally leads back to measuring the next opportunity.

Process improvement isn't about finding fault with people. It's about designing systems that enable consistent excellence. When something goes wrong, resist the urge to blame the operator. Instead ask: Have I brought this process under control? If the answer is no, you know where the real work begins.

The Foundation: Process Wins

It's the Process That Drives the Output

When defects occur sometime the instinct can be to blame the operator. That instinct misses the root cause entirely. People work within the constraints of their processes. Give them better processes and they'll produce better results.

Output quality is determined by process quality—not by inspection or effort alone. Consistent, high-quality outputs are the natural result of well-designed and controlled processes. Attempting to inspect quality into products or relying solely on individual effort cannot compensate for poorly designed or inconsistent processes.

"A bad system will beat a good person every time." — W. Edwards Deming

"Every system is perfectly designed to get the results it gets." — Paul Batalden

"Eighty-five percent of the reasons for failure are deficiencies in the system and process rather than the employee." — W. Edwards Deming

Quality, efficiency, and consistency are properties of well-designed processes—not individual effort alone. By shifting focus from individual performance to process capability, you create sustainable improvement that does not depend on the clever skillful efforts of exceptional operators. The process is the foundation.

1. Measure

Measure Everything That Matters

Plants operate on intuition, opinion, and guesswork when they do not have reliable data. That's not a process that will deliver consistency and predictability; success becomes hit and miss.

Measurement serves two critical functions. First, it provides the feedback necessary to know whether a process is operating within its defined standards. Second, it generates the data required to understand current performance levels and verify that changes actually result in improvements. Without measurement both control and improvement become guesswork rather than data-driven management.

"What gets measured gets managed." — Peter Drucker

"In God we trust; all others must bring data." — W. Edwards Deming

Track the vital few metrics that drive process knowledge and quality results. Install the proper instrumentation to build reliable data collection systems that capture accurate, timely information. Define how things get measured so everyone measures the same way. Learn to distinguish between signal and noise; real changes versus random variation.

2. Baseline

Document Your Current Process

Take time to truly understand the process reality as improvement projects can fail without the clear understanding of bottlenecks and sources of variation. Teams document how they think the process works, or how it's supposed to work, then build improvement plans around that fiction. When results don't come, they blame execution.

Documentation is the foundation of standardization. Without clear written procedures that define each step, the input and output targets and ranges, and decision points, there is no common reference for what the standard should be. Documentation creates the baseline from which all improvement efforts begin and ensures knowledge transfer across the organization.

"If you can't describe what you are doing as a process, you don't know what you're doing." — W. Edwards Deming

"If it isn't written down, it doesn't exist." — Philippe Kahn

Document every step as it happens. Create process maps that show workflows, parameters with their setpoints, decision points, and handoffs. Identify critical process parameters that significantly impact output quality. Define quality characteristics that matter to customers. Establish target values and acceptable ranges for key metrics.

Without an accurate baseline improvement and control can't be measured.

3. Fix

Attack Variation Relentlessly

Variation is what kills consistency. Not bad operators. Not bad luck. Variation.

Process variation leads to defects and rework, unpredictable throughput and scheduling difficulties, wasted materials, time, and effort. It undermines customer confidence and increases costs throughout the value chain.

In extrusion manufacturing the data consistently shows the same pattern. Eighty-five to ninety percent of problems come from process variation—inconsistent material properties, temperature fluctuations, die wear, setup differences, environmental changes. Ten to fifteen percent comes from equipment capacity limits or physical constraints. Most plants invert those numbers in their heads, focusing on the ten percent they can see while the variation that's actually destroying them goes unaddressed.

"If I had to reduce my message to management to just a single point, it would be: understand and reduce variation." — W. Edwards Deming

"Uncontrolled variation is the enemy of quality." — W. Edwards Deming

The fixes are often straightforward once you look in the right places. Tune the barrel heaters for consistent temperature profiles. Replace a worn screw before it creates more variation. Tighten up specifications with your resin supplier so incoming material behaves predictably. Implement a skills matrix so operators are trained and certified before running critical processes. These aren't glamorous solutions, but they're the ones that actually work.

Use 5 Whys, Cause and Effect diagrams, Pareto analysis to find the true sources—not the symptoms, not the most recent incident. The goal is to make the process fundamentally capable of meeting requirements consistently. A process with high variation cannot be controlled, improved, or optimized. Fix the variation first. Everything else waits.

4. Standardize

Standardize Only What's Under Control

Writing standard operating procedures for a process that is not under control produces procedures that are wrong from day one and will most likely be ignored by operators—documenting inconsistency rather than eliminating it. That is not standardization that's fluff to satisfy the latest management requirements.

"Without a standard there is no logical basis for decision making or taking action." — Joseph Juran

"Without standards, there can be no improvement." — Taiichi Ohno

Standardization should only happen after the process is fixed and brought under statistical control. Once there it captures the best-known method for achieving results, creates a stable baseline for measuring future improvements, enables consistent training and reduces dependence on tribal knowledge, and provides a control mechanism to prevent regression to old ineffective methods.

Standardizing and Standard work isn't about rigid compliance. It's about preserving what works while creating a platform for the next level of improvement.

5. Optimize

Optimize Within Your Constraints

With a stable standardized process in place optimization is about fine-tuning performance to approach theoretical limits. Every process operates within constraints—equipment capacity, material properties, facility limitations, economic constraints, regulatory requirements.

Henry Ford put it plainly: "If you think you can or you think you can't, you're right." The same applies to processes. If the team believes the process can be optimized, it will find ways to do it. If it accepts current performance as the ceiling that's exactly where it will stay.

Design of Experiments, statistical process control, and Six Sigma methods squeeze maximum performance from existing resources. These tools work when the process is stable. They produce noise when it isn't.

Balance is critical. Over-optimizing one dimension often creates problems elsewhere. Systems thinking prevents sub-optimizing individual steps at the expense of overall flow.

6. Improve

Breakthrough Improvement Requires a Stable Foundation

Improvement initiatives launched before the process is stable enough to show whether anything is working just add more variation and call it progress.

With a standardized and optimized process as the foundation deliberate improvement can take performance beyond current boundaries. There's a baseline. There's data. A change can be run against the standard and the result is knowable—better, worse, or the same.

"It is impossible to improve any process until it is standardized. If the process is shifting from here to there, then any improvement will just be one more variation that is occasionally used and mostly ignored." — Masaaki Imai

"Almost all quality improvement comes via simplification of design, manufacturing, layout, processes and procedures." — Tom Peters

Test rigorously using the standardized process as the control. Integrate proven changes back into the standard. If it doesn't beat the standard consistently it isn't an improvement.

7. Maintain

Maintain to Sustain

This is where most organizations fail. Not in improvement. In keeping what they built.

Real gains; reduced variation, improved quality, better throughput—quietly erode over twelve to eighteen months. New people come in undertrained. Standards drift. Audits stop. The metrics that drove the improvement get replaced by the crisis of the moment. A few years later the plant is back where it started launching another improvement initiative wondering why the last one didn't stick.

"Sustaining gains is as important as making them in the first place." — John Kotter

Monitor key metrics continuously with control charts and dashboards. Audit standards regularly to verify they're being followed as intended. Document management of change so the next engineer troubleshooting the process knows what was changed, when, and why. Build rapid response systems to address deviations before they become embedded. Invest in ongoing training and skill development for all process team members.

Maintenance isn't passive. It's active ownership of hard-won improvements. The discipline of maintenance separates organizations that achieve lasting excellence from those that cycle through endless improvement initiatives without sustaining results.