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-Now that we know what the requirements are and

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-their main types, let's discuss where requirements come from and

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-there are many possible sources for requirements so I'm

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-going to list here the main ones. The first one are

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-clearly stakeholders, anybody who is effected by the system

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-and its functionality. Customers, users, and so on. The second

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-typical social requirement is the application domain. For example,

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-the fact that my software is running within a bank,

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-or within a school. Why is the application domain a

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-social requirement? Well, because there are constraints that are characteristics

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-of the application domain that will affect the functionality of

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-the system. For a simple example, just think about regulations.

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-So banking regulations and school regulations in these cases. Those

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-are things that might affect the functionality of my system

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-and, therefore, that may become part of my requirements. And,

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-finally, documentation can be an additional source of requirements. For example,

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-notes, papers, manuals, books. So everything that refers to

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-the functionality of the system that we're going to build.