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What is Software Specification Activity? Describe the four main phases of software specification activity?

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Software Specification:

Software specification or requirements engineering is one of the four activities of software process. In software specification, the task is to identifying and defining the services to be provided from the system and what are the constraints in the operations of the system and in the development of the system. This stage, among the four activities of software process, is critical enough as this is the first stage of the process and defines the whole system. Missing or misunderstanding requirements, leaving gaps or errors will ultimately cause higher development cost, time and rework.  

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