Содержание
- 2. Six Phases of the System Development Life Cycle Preliminary Investigation Assesses feasibility and practicality of system
- 3. Six Phases of the System Development Life Cycle System Development New hardware and software is acquired,
- 4. SDLC Phases Preliminary Investigation System Operation & Maintenance System Analysis System Implementation n System Design System
- 5. Phase 1: Preliminary Investigation Determine if a new system is needed Three primary tasks: Define the
- 6. In depth study of the existing system to determine what the new system should do. Expand
- 7. Phase 2: System Analysis Tools Used Checklists - list of questions Top-down analysis - start with
- 8. Phase 2: System Analysis Documentation Produced Complete description of current system and its problems Requirements for
- 9. Phase 3: System Design Uses specifications from the systems analysis to design alternative systems Evaluate alternatives
- 10. Phase 3: System Design Tools Used Computer-Aided Software Engineering (CASE) tools are software-based products designed to
- 11. Phase 3: System Design Documentation Produced System Design Report Describe Alternatives including: Inputs/Outputs Processing Storage and
- 12. Phase 4: System Development Build the system to the design specifications Develop the software Purchase off-the-shelf
- 13. Phase 5: System Implementation Convert from old system to new system Train users Compile final documentation
- 14. Phase 5: System Implementation Types of Conversion Direct/plunge/crash approach – entire new system completely replaces entire
- 15. Phase 5: System Implementation User Training Ease into system, make them comfortable, and gain their support
- 16. Phase 6: Operations & Maintenance Types of changes: Physical repair of the system Correction of new
- 17. Phase 6: Operations & Maintenance Evaluation Methods Systems audit - performance compared to original specifications Periodic
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