4 - sw life cycle models

4 - sw life cycle models - misconception about the...

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Software Life-Cycle Models Software Life-Cycle Models (Software Process Models) 1. Define the phases that are part of the software development process for a product; 2. Define how the development process moves from one phase to another. The second part of the above definition distinguishes life-cycle models from software processes.
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Build-and-Fix Model Problems No requirements phase No analysis phase No design phase (!) Everything is done during implementation change is very expensive. Radical requirement shifts could lead to a complete fresh start. We need a more complete life-cycle model: Game plan Phases other than implementation & maintenance Project milestones that are predictable and measurable
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Waterfall Model Observations : All phases are present in this model and we are told how they are connected You can move back and forth between phases as often as necessary – a
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Unformatted text preview: misconception about the waterfall model Notes on the Waterfall Model • Characterized by o Feedback loops o Documentation driven • Advantages o Documentation is properly generated o Natural generation of project milestones o Maintenance easier • Disadvantages o First functionality is only seen very late in the game o That means the real litmus test whether the right product is being built happens at the end of the life-cycle model – before that that all just paper – difficult to visualize, especially for the customer. & The disadvantages can be mitigated by a modified waterfall model: rapid prototyping • Here a rapid prototype is substituted for the requirements phase in the standard waterfall model above. • A rapid prototype is a working model functionally equivalent to a subset of the product. • A prototype should NEVER become the product! Our Life-Cycle Model...
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This note was uploaded on 10/03/2011 for the course CSC 592 taught by Professor Staff during the Spring '11 term at Rhode Island.

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4 - sw life cycle models - misconception about the...

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