The spiral model is an iterative model that attempts to combine advantages of the top-down and bottom-up models of software design. The goal is to reduce, as much as possible, an application’s time-to-market; in the traditional waterfall model, since each step must be completed before the next one starts, the time-to-market can be much longer.
The system requirements are defined in as much detail as possible. This usually involves interviewing a number of users representing all the external or internal users and other aspects of the existing system.
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