It is an important and urgent issue to improve process capability in quality control. Process capability refers to the uniformity of the process. The variability in the process is a measure of the uniformity of output. A simple, quantitative way to express process capability, the degree of variability from target in specification is defined by process capability index(PCI). Almost process capability indices are defined under normal distribution. However, these indices can not be applied to the process of non-normal distribution including reliability. We investigate current research on the process of non-normal distribution, and advanced method and technology for developing more reliable and efficient PCI. Finally we suggest the perspective for future study.

Abstract
 1. 서론
 2. 공정관리의 기본개념
  2.1 공정능력분석
  2.2 공정능력지수
 3. 국외연구의 동향
  3.1 비정규분포하에서의 공정관리를 위한 유관논문
  3.2 비정규분포를 갖는 공정에 대한 PCI(공정능력지수)평가 방법
  3.3 비정규분포를 갖는 공정에 대한 통계적 공정관리 방법
 4. 국내연구의 동향
  4.1 비정규분포를 갖는 공정에 대한 PCI(공정능력지수)평가 방법
  4.2 비정규분포를 갖는 공정에 대한 SPC(통계적 공정관리)방법
 5. 연구사례
  5.1 비정규분포에 대한 공정능력 평가에 관한 연구사례
  5.2 신뢰성 6 Sigma를 위한 연구사례
 6. 결론
 7. 참고문헌

• 김종걸 | Jong-Gurl,Kim
• 엄상준 | Sang-Joon,Um
• 김영섭 | Young-Sub,Kim
• 고재규 | Jae-Kyu,Ko