The Waterfall Model A Case Study

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Presentation transcript:

The Waterfall Model ----- A Case Study 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 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

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

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

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

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

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

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

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

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?

Alternative Life-Cycles Phases remain similar Results remain similar INTERACTION changes

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