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What are the five phases of the SDLC? What are the steps in a preliminary investigation (system planning)? What is the objective of each phase

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What are the five phases of the SDLC? What are the steps in a preliminary investigation (system planning)? What is the objective of each phase of the SDLC? Describe each objective briefly. What is the difference between functional requirements and nonfunctional requirements? List the five component parts (symbols) of a DFD. Briefly describe what each symbol represents

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