The difference between a stable process and an expensive problem is often hidden in two simple capability indices.

One of the most underrated Six Sigma methodologies, and one that rarely gets the attention it deserves in the world of continual improvement, is process capability, specifically Cp and Cpk.

For us here at NS KUNSTSTOFFTECHNIK - CZ, capability indices aren't just statistical outputs. They're decision-making tools that shape how we design, validate, and scale every injection molded component we produce.

Before we approve a process window, we validate capability.

Before we scale a tool to multi-cavity, we validate capability.

Before we commit to long-term supply, we validate capability.

Why? Because Cp and Cpk tell us the truth about a process. Not just how it performed once, but how it performs consistently over time. They reveal whether a part will remain within tolerance across shifts, perform consistently across production batches, and withstand normal process and environmental variation.

They show whether a tool is ready for serial production or needs further refinement, while giving our customers confidence that quality isn't just controlled, but predictable.

Six Sigma gives us the framework. Our engineers provide the discipline. Our customers see the results. 🦾

How does your organization use process capability? Is Cp and Cpk simply a quality metric, or does it actively influence engineering and production decisions across the product lifecycle?