Software demand analysis is the first stage before software development, but also related to the success or failure of software development of the key steps, in the whole process of software development, it can be said that this stage to take up considerable time. If the requirements analysis is done, then in the future software design process, you can save a lot of time. The street is not about determining how the system does its job, it's about determining what the system has to do, and it's about making complete, correct, clear, and specific requirements for the target system.
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