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In this section we cover the major development methodologies used in software development. We discuss the trade offs of each in terms of flexibility in the face of changing requirements. This is important since one thing that is certain when it comes to developing software is that the customer at some point is going to change their mind about what they want! We outline the development models and then dig into the specifics of each: - Waterfall model - Prototype model - Spiral model - Agile model