The spiral model is a software development lifecycle model that iterates through phases such as analysis, design, implementation, and testing to incrementally add and refine functionality. It is designed to be flexible in accommodating changing user requirements, addressing a key limitation of the waterfall model. Each iteration is likened to one loop of a spiral.

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• 2014h26a #42図のように，改良及び機能追加を繰り返すことによって利用者の要求の変動に柔軟に対処したシステム開発を行う開発モデルはどれか。 ![p016_img-1.jpeg]…