In the process capability ratio, a greater upper and lower specification limit than process variability indicates what?

The process capability ratio is used to assess how well a process can produce output within specified limits. When the upper and lower specification limits are greater than the process variability, it means that the process is capable of producing items that meet quality standards consistently.

In this context, a greater specification range compared to process variability indicates that the majority of the process output will fall within the acceptable limits, making it likely that the desired quality level can be achieved without excessive defects. This signifies that the process is stable and capable of producing products that meet customer expectations.

This assessment of capability is crucial for quality management and production planning, as it allows organizations to set realistic quality targets and ensures that processes are aligned to meet those targets efficiently.