Abstract

Assessment of process health is an important aspect of any quality system. While control charts are often used in the day-to-day operations of processes, it is also helpful to take a retrospective look at past performance in the form of an overall process health assessment to identify specific opportunities for future improvement efforts. In this paper, we recommend a complete set of indices to evaluate various aspects of process health including actual process performance, process stability, process centering, and potential process capability. We show how the set of indices can be particularly useful when there are many processes to evaluate simultaneously. Both tabular and graphical methods using these indices will be shown for quick identification of potential problem areas that warrant more investigation. We also demonstrate how these metrics can be used when there are both two-sided and one-sided specifications (with and without a defined target). Finally, we explore the connection between the process and measurement system and recommend indices for evaluating the health of the measurement system.

摘要

评估过程健康是任何质量体系​​的重要方面。虽然控制图通常用于流程的日常操作中，但以整体流程健康评估的形式回顾过去的表现也很有帮助，以识别出未来改进工作的特定机会。在本文中，我们建议使用一套完整的指标来评估过程运行状况的各个方面，包括实际过程性能，过程稳定性，过程居中和潜在过程能力。我们展示了当有许多过程需要同时评估时，索引集如何特别有用。将显示使用这些索引的表格和图形方法，以快速识别潜在的问题区域，从而需要进行更多调查。我们还演示了在同时具有双面规范和双面规范（有或没有定义目标）的情况下如何使用这些指标。最后，我们探索过程与测量系统之间的联系，并推荐用于评估测量系统运行状况的指标。