• The data and control to be processed, as well as the function, performance, limitations, interfaces, and dependability, are all described in the software scope. Prior to the start of estimation, the functions indicated in the statement of scope are assessed and, in some cases, refined to offer greater detail.
• Decomposition is frequently effective since both cost and schedule estimates are functionally orientated. Processing and reaction time requirements are included in performance considerations. External hardware, accessible memory, and other existing systems all impose constraints on the software.

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