The reason for adopting sedentary life is assumed that the problems the Jomon people had in order to adopt the sedentary life up to that time were being solved; in fact, the Jomon people were able to solve problems of securing food, waste disposal issues, and the need to come to terms with the view of life and death in the sedentary life.
定住が開始された理由としては、それまで縄文人集団が定住を避けていた理由、すなわち食料の確保や廃棄物問題、死生観上の要請などが定住によっても解決出来るようになったためではないかと見られる。