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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.