Stability assessment with the stability index

Abstract

Assessment of process stability is an important way to ensure high quality. There have been various approaches in the literature to assess process stability. We describe these methods and provide a minor modification of a previous approach, which we call the stability index (SI). We provide justification for the SI as a best practice for practitioners who assess process stability. We provide examples of the computation of the SI for various scenarios and show how the SI can be used in conjunction with capability indices in a process performance graph.

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