The coefficient of variation(CV) which is a relatively dimensionless measure of variability is widely used to describe the variation of sample data. But little research is available to its distribution, confidence interval and interpret method etc. In this paper, we give an outline of statistical properties of coefficient of variation and design of control chart based on this statistic. Construction procedures of control chart are presented. The proposed control chart is an efficient method to monitoring a process variation for multiple product processes. Futhermore, the performance is evaluated by average run length(ARL).

Abstract
 1. 서 론
 2. 변동계수의 분포
 3. 관리도의 설계
 4. 수행도 분석
 5. 결 론
 참고문헌

• 이만식(한양대학교 산업공학과)
• 강창욱(한양대학교 산업공학과)