계약환경의 유동성에 대비하여 사정변경의 원칙이 논의되고 있으며, 그 효과로는 일반적으로 계약의 수정 또는 계약의 해소 등을 들고 있다. 그러나 사정변경의 원칙에 대한 요건을 구비하였다고 하여 이러한 효과가 직접 발생하도록 하는 것보다는 1차적으로 당사자의 교섭을 통하여 계약을 수정하거나 해소할 수 있도록 의무지울 필요가 있다.이 연구의 목적은 바로 이러한 재교섭의무를 규범적으로 정립하기 이전의 단계로서 재교섭의무의 기초이론을 살펴보는 것이다.재교섭의무에 대한 연구에서 재교섭의무의 개념이 매우 중요함에도 불구하고 아직 정립되지 못하고 있다. 또한 재교섭의무를 인정할 것인지에 대해서도 견해가 대립하고 있으나 그리 연구가 활발한 것은 아니다. 따라서 기본이론에서는 사정변경의 원칙으로서 재교섭의무의 지위를 개관하고 그 기본적 절차를 살펴볼 필요가 있다.

Principle of changes of circumstances is being discussed in preparation of fluidity of contract environment and its effect in general, adjustment of contract or revocation of contract are being discussed. However, despite the requirements for the principle of changes of situations are furnished, it is necessary to obligate the parties primarily revise contract or settle contract through negotiations instead of allowing these effects take place directly. The purpose of this study is to examine the fundamental theory on renegotiation obligation before normal thesis of renegotiation. The concept of renegotiation is very important, but it is not constructed. And There is a serious controversy whether admitting or not. However, a study on it is not vivacious. Therefore it is needed to examine on the position of a renegotiation in the circumstance change, and on the fundamental process.

Principle of changes of circumstances is being discussed in preparation of fluidity of contract environment and its effect in general, adjustment of contract or revocation of contract are being discussed. However, despite the requirements for the principle of changes of situations are furnished, it is necessary to obligate the parties primarily revise contract or settle contract through negotiations instead of allowing these effects take place directly. The purpose of this study is to examine the fundamental theory on renegotiation obligation before normal thesis of renegotiation. The concept of renegotiation is very important, but it is not constructed. And There is a serious controversy whether admitting or not. However, a study on it is not vivacious. Therefore it is needed to examine on the position of a renegotiation in the circumstance change, and on the fundamental process.

circumstance change, renegotiation obligation, contract amendment.