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SOFTWARE LIFE-CYCLES

SOFTWARE LIFE-CYCLES The Waterfall Model ----- A Case Study Software process / Life-Cycle? A project is a set of activities, interactions and results ... A “life-cycle” or a software process is the organizational framework for a project. The Waterfall Life-Cycle

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SOFTWARE LIFE-CYCLES

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  1. SOFTWARE LIFE-CYCLES The Waterfall Model ----- A Case Study

  2. Software process / Life-Cycle? • A project is a set of activities, interactions and results ... • A “life-cycle” or a software process is the organizational framework for a project.

  3. The Waterfall Life-Cycle • is the ancestor of all other models • still prevalent in practical application • exists in many variations • supported by a multitude of tools • no at all a perfect solution

  4. Requirements The WATERFALL MODEL System Design Detailed Design Implementation Installation & Testing • set of activities: sequential phases

  5. Requirements The WATERFALL MODEL System Design Detailed Design Implementation Installation & Testing • transformation of results includes verification

  6. Requirements The WATERFALL MODEL System Design Detailed Design Implementation Installation & Testing • completeness • of activities: Maintenance

  7. Requirements The WATERFALL LIFE-CYCLE: interactions System Design Detailed Design Implementation Installation & Testing Maintenance

  8. Cost Ratio of Errors Requirements : Maintenance = 1 : 200

  9. Activities during Phases • Requirements: establish your customer’s needs • System Design: develop the system’s structure • Detailed Design: develop module structures • Implementation: write source-code • Testing: check what you have developed • Installation: bring the system into production • Maintenance: correct, adapt, improve

  10. Results of Phases • Requirements: software requirements specification • System Design: software design chart; interfaces • Detailed Design: module specifications • Implementation: programs, files, etc... • Testing: test suits and test results • Installation: run-time version of the system • Maintenance: new version or release of the system ==> Documents

  11. Discussion Questions • What is Software Engineering? • Software Engineering vs. System engineering • What are the attributes of a good software? • What are the key challenges facing software engineering today?

  12. Alternative Life-Cycles • Phases remain similar • Results remain similar • INTERACTION changes

  13. End of Section 1a coming up: more about life-cycles ...

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