V-Model in Testing

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What is V model? 

                    V-model is one of the software development methodology which is a altered form of 'Waterfall' model.The V-model represents a software development process (also applicable to hardware development) which may be considered an extension of the waterfall model. Instead of moving down in a linear way, the process steps are bent upwards after the coding phase, to form the typical V shape.
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               V- model means Verification and Validation model. Just like the waterfall model, the V-Shaped life cycle is a sequential path of execution of processes. Each phase must be completed before the next phase begins.  Testing of the product is planned in parallel with a corresponding phase of development.
                                                                       V-model

    
 When to use the V-model:
  • The V-shaped model should be used for small to medium sized projects where requirements are clearly defined and fixed.
  • The V-Shaped model should be chosen when ample technical resources are available with needed technical expertise.
 Advantages of V-model:
  • Simple and easy to use.
  • Testing activities like planning, test designing happens well before coding. This saves a lot of time. Hence higher chance of success over the waterfall model.
  • Proactive defect tracking – that is defects are found at early stage.
  • Avoids the downward flow of the defects.
  • Works well for small projects where requirements are easily understood.
Disadvantages of V-model:
  • Very rigid and least flexible.
  • Software is developed during the implementation phase, so no early prototypes of the software are produced.
  • If any changes happen in midway, then the test documents along with requirement documents has to be updated.

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