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Sidebar 4.1 Why Are Requirements Important?

Sidebar 4.1 Why Are Requirements Important?. Top factors that caused project to fail Incomplete requirements Lack of user involvement Unrealistic expectations Lack of executive support Changing requirements and specifications Lack of planning System no longer needed

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Sidebar 4.1 Why Are Requirements Important?

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  1. Sidebar 4.1 Why Are Requirements Important? • Top factors that caused project to fail • Incomplete requirements • Lack of user involvement • Unrealistic expectations • Lack of executive support • Changing requirements and specifications • Lack of planning • System no longer needed Requirements error can be expensive if not detected early

  2. The Requirements Process • Outcome – Software Requirements Specification (SRS)

  3. Stakeholders • Clients: pay for the software to be developed • Customers: buy the software after it is developed • Users: use the system • Domain experts: familiar with the problem that the software must automate • Market Researchers: conduct surveys to determine future trends and potential customers • Lawyers or auditors: familiar with government, safety, or legal requirements • Software engineers or other technology experts

  4. Entity-Relationship Diagram for turnstile problem

  5. UML Class Diagram for Library Problem  

  6. Message Sequence Chart for library load

  7. State Machines for Turnstile Problem

  8. Use Cases • Library use cases including borrowing a book, returning a borrowed book, and paying a library fine

  9. Prototyping Example • First a workable simple Interface for entering a date

  10. Prototyping Example • A more interesting and sophisticated interface

  11. Prototyping Example • Next version – user is presented with three slide bars • Pros and Cons?

  12. Techniques to validate requirements

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