| Summary: | 碩士 === 義守大學 === 管理科學研究所 === 90 === Abstract
In general speaking, Quality Cost includes four parts: Appraisal Costs, Prevention Costs, Internal Failure Costs and External Failure Costs. A new term of quality cost index is defined and introduced in this research, which is used to set up a model to describe the relationship between it and quality level.
Considering the global competitive market becomes more serious, customers might accept products that are not well developed and hope to gain the major profit at the beginning period of product life cycle. Usually supplier is asked to shorten its design schedule and allow them to improve its quality level in the future time as required. How to manage the quality cost becomes a problem while continuous design change and process quality improvement are applied together.
In most study of quality costs, descriptive statistics methods are used and it only shows the change of quality costs accumulated in each month. However after we had examined the External Failure Costs (EFC) of each month from some businesses with endurable product, we found that it is the result of poor quality produced on some previous months. It is called the time-lag problem of external failure cost. Based on the attribute of Time-lag of EFCs, businesses are categorized into four types here.
Consequently, we provide a model to describe relationships between quality growth and quality cost Index for stages within the Life cycle of product and nine decision rules to assist the management of quality.
Keywords：Quality Costs Index, Quality Level Growth, Products Life Cycle, Time-lag of External Failure Costs, Design Change, Regression Analysis
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