When the range of process variation is larger than the design specifications, the process capability index will be less than 1.

Question

Quizplus · Accepted Answer

Process capability index (Cpk) measures whether the process is capable of producing products within customer specifications. Cpk values less than 1 indicate that the range of process variation is larger than the design specifications, which means the process is not capable of meeting customer requirements consistently.

When the Range of Process Variation Is Larger Than the Design