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Requirements analysis

Requirements analysis. Requirements : informal description of what customer wants. Specification : precise description of what design team should deliver. Requirements phase links customers with designers.

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Requirements analysis

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  1. Requirements analysis • Requirements: informal description of what customer wants. • Specification: precise description of what design team should deliver. • Requirements phase links customers with designers. • Sia i requisiti che le specifiche riguardano il comportamento esterno del sistema, non la sua struttura interna Overheads for Computers as Components

  2. Types of requirements • Functional: input/output relationships. • Non-functional: • timing; • power consumption; • manufacturing cost; • physical size; • time-to-market; • reliability. Overheads for Computers as Components

  3. Good requirements • Correct. • Non redundant. • Unambiguous. • Complete. • Verifiable: is each requirement satisfied in the final system? • Consistent: requirements do not contradict each other. Overheads for Computers as Components

  4. Good requirements, cont’d. • Modifiable: can update requirements easily. • Traceable: • know why each requirement exists; • go from source documents to requirements; • go from requirement to implementation; • back from implementation to requirement. Overheads for Computers as Components

  5. Setting requirements • Customer interviews. • Comparison with competitors. • Sales feedback. • Mock-ups, prototypes. • Next-bench syndrome (HP): design a product for someone like you. Overheads for Computers as Components

  6. Specifications • Capture functional and non-functional properties: • verify correctness of spec; • compare spec to implementation. • Many specification styles: • control-oriented vs. data-oriented; • textual vs. graphical. Overheads for Computers as Components

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