최근 컴포넌트 기반 개발이 소프트웨어 개발의 새로운 패러다임으로 대두되고 있는 가장 큰 이유는 컴포넌트의 재사용으로 인해 얻을 수 있는 개발 기간의 단축, 유지ㆍ보수의 용이함 등의 장점들 때문이다. 재사용의 개념을 시스템으로 확장하여 생각하면 기존 레거시 시스템을 컴포넌트 기반 시스템으로 바꾸는 것이며 이를 위해서는 레거시 시스템의비즈니스 로직을 추출하여 컴포넌트화 해야 한다. 본 논문에서는 기존 레거시 시스템에서 컴포넌트 기반 시스템으로 변환하기 위해 필요한 비즈니스 로직 추출 방법으로 레거시 시스템 분석을 통해 얻은 시스템 플로우 그래프, 프로그램 호출 그래프, 패러그래프 흐름 그래프 등의 그래프 등을 이용하여 레거시 시스템을 이해하고 추출 정보로써 핵심 변수와 패턴 식별을 이용한 방법을 제안한 후 구현된 비즈니스 로직 추출기를 이용하여 구체적으로 COBOL 소스 코드에서 비즈니스 로직이 추출되는 과정을 설명하겠다.
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