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In fact, software processes are normally characterized by several phases, what

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we call the software phases, and only one of these phases is

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mainly focused on coding. The other phases are meant to support

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other parts of software development. The first of these phases is called

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requirements engineering and that's the phase in which we talk to

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the customer, to the stakeholders, whoever we are building the software for.

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And we try to understand what kind of system we need

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to build. Then we use this information to define our design and

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the design is the high-level structure, that then can become more

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and more detailed, of our software system. Once we've defined our

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design we can actually move to the next phase, which is

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the implementation, in which we write code that implements the design which

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we just defined. After implementing the code, we need to verify

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and validate the code. We need to make sure that the code

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behaves as intended. And finally, we need to maintain the code.

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And maintenance involves several activities like,

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for example, adding new functionality or

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eliminating bugs from the code or responding to problems that

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were reported from the field after we released the software.

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We will look at all of these activities and of

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the software development process in detail, in the rest of the

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class. And for each activity, we will look at the

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fundamental principles and how it is done currently. And in

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some cases, we will also look at some advance ways

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to do it. For example, more research approaches for that activity.