When one is building an application for a very specific purpose - say, processing a charge to an account - one knows what one needs to do and how one needs to do it. One's architecture might be straightforward, even simple. In the case of enterprise applications, however, a lot of thought has to go into just that topic - what one needs to do and how one needs to do it - before one can even start coding the first line. In the case of large projects, the person doing this thinking is typically an IT architect. This person is responsible for translating business requirements into software requirements. For small projects, and small businesses, this may be a very straightforward task.
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