| Summary: | 碩士 === 國立臺灣科技大學 === 工業管理系 === 92 === Statistical process control（SPC）is broadly used in controlling and improving process capability in the manufacturing industry. The process capability indices have been used in the quality control by most engineers that to evaluate a production process whether it is capable or not. The customer purchases an entire product consisting of many characteristics. Hence, we develop a formula for the process capability of an entire product, and obtain an integrated process capability index.
First, the existing process capability indices including unilateral, symmetric bilateral, and asymmetric bilateral are reviewed. Additionally, the work describes the existing methodologies assessing process capability for a multi-process product, and addresses the existed methodologies evaluating the integrated process capability for a product, because of the product complexity is not always useful in the multivariate condition. A case study is also presented to illustrate the effectiveness of the proposed integrated capability index. This index including weighted geometric mean and weighted arithmetic mean method can be applied to any products. It is believed that this procedure and methodology is helpful and can provide great insight for quality improvement.
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