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Lifecycle models are described as distinct choices from which you must select. In practice, however, you can apply more than one model to a single project. You can start a project with a spiral model to help refine the requirements and specifications over several iterations using prototyping. Once you have reduced the risk of a poorly stated set of requirements, you can apply a waterfall lifecycle model to the design, coding, testing, and maintenance stages.

Other lifecycle models exist. Several third-party resources contain information about other development methodologies.