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Now before we move to the last part of the lesson, let's

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have a quick quiz on software process models to make sure that

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we are all on the same page. So I am going to

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ask you two questions. The first question is which of the following models

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is most suitable to develop a software control system? And when you

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think about the software control system, you can think about for example

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the control system for the software in an airplane. Would you rather

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use a pure waterfall model? Test

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driven development? Or an evolutionary prototyping approach?