Software Development Life Cycles

Software Development Life Cycles

1. Waterfall Model

   • Advantages
     • Simple and easy to understand and use
     • Easy to manage due to the rigidity of the model.
     • Easy to arrange tasks
   • Disadvantages
     • High amounts of risk and uncertainty
     • Difficult to measure progress within stages
     • Poor model for long and ongoing projects
   • The waterfall model illustrates the software development process in a linear sequential flow. Im waterfall model phases do not overlap.

2. Iterative Model

   • Advantages
     • Progress can be measured
     • Results are obtained early and periodically
     • Parallel development can be planned
   • Disadvantages
     • More resources may be required
     • Not suitable for smaller projects
     • Highly skilled resources are required for risk analysis.
   • The iterative model illustrates at each iteration, design modifications are made and new functional capabilities are added.

3. V-Model

   • Advantages
     • Simple and easy to understand and use
     • Works well with smaller projects
     • Phases are completed one at a time
   • Disadvantages
     • High risk and uncertainty
     • Poor model for ongoing projects.
     • No working software id produced until late during the life cycle
   • The V-Model illustrates where execution of process happens in a sequential manner in v-shape.

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