This paper presents a economic design of synthetic control chart that is an VSI(variable samlping interval) X control chart and conforming run length chart. Computer simulation is carried out for comparing performance of developed control chart with X-CRM synthetic chart. We found that optimal parameter of suggested chart for minimize quality cost. And then a comparison and analysis between synthetic VSI X-CRL chart and X-CRM synthetic chart in the economic aspect. Then VSI X-CRL chart consistently produces smaller quality cost than X-CRM synthetic chart.

Abstract
 1. 서론
 2. VSI X-CRL 합성관리도
 3. VSI X-CRL 관리도의 경제적 설계
 4. 결 론
 참고문헌

• 송서일(동아대학교 산업경영공학과)
• 박현규(동아대학교 산업경영공학과)
• 정혜진(동아대학교 산업경영공학과)