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Now let's discuss the next phase of software development,

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which is software design. Software design is the phase

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where software requirements are analyzed in order to produce

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a description of the internal structure and organization of

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the system. And this description will serve as the

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basis for the construction of the actual system. Traditionally,

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the software design phase consists of a series of

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design activities. Which normally consists of the architectural design phase,

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the abstract specification, interface design,

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component design, data structure and

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algorithm design. And notice that this is just a possible list

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of activities. But you can also characterize design activities in

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many different ways. And if you're looking at different books, and

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different sources, you might find different activities described. But the

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core idea, the important point is that we go from sort

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of a high-level view of the system, which is the

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architectural design, to a low-level view, which is the algorithm design.

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And these activities result in a set of design

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products, which describe various characteristics of the system. For

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example, they describe the architecture of the system, so

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how the system is decomposed and organized into components, the

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interfaces between these components. They also describe these components

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into a level of details that is suitable for

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allowing their construction. We will discuss the details of

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software design and talk extensively about these different actives and

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these different products in the third mini course of this class.