Companies adopted a program called Six Sigma, in order to make fundamental changes in the way the company operated to fulfill customers' expectations. Six Sigma reduces the occurrence of defects. However, in the course of Six Sigma process steps, companies are in the face of problems. This study is to solve the problems using TOC(Theory of Constrains). As a specific case, we review Six sigma's Define phrase. We apply TP(Thinking Process) of Toc for Define Phrase.

Abstract
 1. 서 론
 2. 외상매출채권의 현금화 사이클타임 단축 프로젝트의 개요 [1]
 3. 6시그마 정의 단계에서의 TOC 사고프로세스를 적용
  3.1. 사고프로세스의 CRT(현재상황나무)를 이용한 프로젝트 선정
 4. 결 론
 참고문헌

• 유봉근(서경대학교 산업공학과)
• 고현우(서경대학교 산업공학과)