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+Hi, in the last lesson we provided an overview of the course and motivated the
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+need for software engineering. In this lesson,
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+we will present and start discussing several traditional
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+software engineering life cycle models. We will
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+talk about their main advantages, and also about
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+their shortcomings. We will also talk about
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+classic mistakes in software engineering that is well
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+known ineffective development practices, that when
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+followed, tend to lead to better results. And
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+covering those, will hopefully help us to avoid
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+them in the future. And because in this
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+lesson, I will discuss some fundamental aspects of
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+software engineering, to suitably introduce these topics, I
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+went to the University of Southern California, to
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+interview one of the fathers of software engineering;
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+Professor Barry Boehm.
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+&gt;&gt; A well, a software life cycle is a sequence of, of decisions that you
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+make, and it's fundamentally those decisions are
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+going to be part of the history of the
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+software that. You are going to build that other people are going to use, and
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+the process model is basically answering the question of what do I do next and
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+how long shall I do it for. And again, because there are a lot of different ways
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+you can make that decision, you need to
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+figure out which models are good for which particular
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+situations. So, for example, we've, written a book
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+that's called Balancing Agility and Discipline. It says under
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+what conditions should you use agile methods, under
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+which conditions should you invest more time in analyzing
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+the situation and planning what you're going to do and the like. And so,
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+typically if the project is, is small where it's three to ten
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+people, agile works pretty well. If it's 300
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+people, then I think we don't want to go that way. If the affect of
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+the defect is loss of comfort or limited funds, then agile is fine,
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+but if it is a loss of life, then you don't. On the other hand if, if
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+you have a situation where you have lot
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+of unpredictable change, you really don't want to spend
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+a lot of time writing plans and lots of documents. In some cases you may have a
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+project where you want to do waterfall in
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+some parts and agile in others. So, these are
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+the kind of things that, that make the choice of life cycle process
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+model very important and very interesting as a subject of research.