V-Model

  V- Model:      

                V- Model means Verification and Validation Model. V-Model is just like the waterfall model, the V-Shaped life cycle is a sequential path of execution processes. Each phase must be completed before the next phase begins. In V-Model development team activities and testing team activities will start same time. Both Waterfall Model and V-Model they are quite similar to each other.

                    V-Model diagram shows Software Development activities on the Left hand side of Model and the Testing team activities on the Right hand side of the model.

     Following is a Diagrammatic Representation of Different phases of  V-Model

Testing is divided into four phases as follows:
 1)Unit Testing
 2)Integration Testing
 3)System Testing
 4)Acceptance Testing

      

Advantages of V-model:

• Simple and easy to use.
• Each phase has specific deliverable.
• If a mistake happened in any phase no need to start the process from the beginning.
• Testing activities like planning,test design,happens well before coding. This saves a lot of time.
• Works well for small projects where requirements are easily understood.

Disadvantages of V-model:

• Project definition is Stable
• It needs lot of resources and money.
• Software is developed during the implementation phase, so no early prototypes of the software are produced.
• If any changes happen in mid of the project, then the test documents along with requirement documents has to be update.

When to use the V-model:

•  V-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.