Abstract
Abstract The Sigma Level, proposed by Motorola Inc., is one of the many Process Capability Index (PCI)’s that havebeen presented since the 1970’s. It is used to evaluate process capability and unlike other PCI’s, it has anadvantage in that it uses population probability distribution. However, it is originally designed for massproduction and is inadequate to evaluate prototypes or early products in the R&D stages. For use in suchcases, we propose an R&D target Sigma Level, derived by considering 1.5 sigma shifts in traditional sigmalevel from a statistical point of view. We also explain the way to nd robust limits for design tolerancebecause the sigma level or defect probability is useful to establish economical tolerance limits at the R&Dstage and mass production.Keywords: Process Capability Index(PCI), Sigma Level, R&D Sigma Level, 1.5 sigma shift, robust limits,design tolerance 1. 서론 20세기 이후 제품/서비스에 대한 품질 향상의노력은체계적인품질 관리 기법과 품질 개선이론을발전시켜 왔다 (Donaldson, 2004). 특히 1970년대
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