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+At this point, you know the possible activities, the
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+possible phases performed during the software development process. But there
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+this something that we still haven't discussed, which is
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+very important. And that is how should we put these
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+activities together to develop software? And this all comes
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+down to the concept of software process model. Also called
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+software lifecycle model. And what this is, is a
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+prescriptive model of what should happen from the very beginning
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+to the very end. Of a software development process. The
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+main function of the life cycle model is to determine
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+the order of the different activities so that we know
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+which activities should come first and which ones should follow. Another
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+important function of the life cycle model is to determine
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+the transition criteria between activities. So, when we can go from
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+one phase to the subsequent one. In other words, what
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+the model should describe is what should we do next and
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+how long should we continue to do it for each activity
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+in the model. Now lets see a few traditional software process
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+models. I will discuss them here at the high level and
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+then revisit some of these models in the different mini courses.