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Rapid application development (RAD) is an approach to software development put less emphasis on planning and more emphasis on process. RAD includes alternatives to the conventional waterfall model of software development and it specifically dates to James Martin's approach to rapid development. In contrast to the waterfall model, which calls for rigorously defined specification to be established prior to entering the development phase, RAD approaches emphasize adaptability and the necessity of adjusting requirements in response to knowledge gained as the project progresses. Prototypes are often used in addition to or sometimes even in place of design specifications.