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After we have designed our system we can implement

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it. In the implementation phase what we do is basically

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taking care of realizing the design of the system

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that we just created and create an actual software system.

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There are four fundamental principles, four pillars that can

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affect the way in which software is constructed. The first

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one is the reduction of complexity. This aims to build

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software that is easier to understand and use. The second

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pillar is the anticipation of diversity. Which takes into

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account that software construction might change in various way over

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time. That is that software evolves. In many cases,

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it evolves in unexpected ways. And therefore, we have to

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be able to anticipate some of these changes. The

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third pillar is the structuring for validation. Also called design

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for testability. And what this means is that we

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want to build software so that it is easily testable

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during the subsequent validation and verification activities. Finally, and

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this is especially true within specific organizations and or

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domains. It is important that the software conforms to

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a set of internal or external standards. And some examples

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of this might be, for example, for internal standards,

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coding standards within an organization, or naming standards within an

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organization. As for external standards, if for example you

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are developing some medical software. There are some regulations and

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some standards that you have to adhere to in

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order for your software to be valid in that domain.