Question

Compare and contrast the Waterfall and V-Model of SDLC. Present two cases where each of the models will be best suited

Answer 1

1.The major difference between a V-Model and Waterfall model is that the testing activities like unit testing, integration testing, system testing and acceptance testing starts in the begining in case of V-model thats's why it's full verification and validation model as first the without executed the code the documents related to software design are verified manually and then the code is executed to validate whether it's upto the specifications provided by the user and market demands. The testing activities in case of waterfall model starts after the development activities are over that is when the requirement analysis, system design and implementation stage of the waterfall model is over.

2. Waterfall model is less flexible as compared to V model.

3. Waterfall model is less expensive as compared to V model.

4. Waterfall model re-usability is limited whereas the V model is re-usable upto some extent.

5. Since testing is done at each phase in case of V model so the guarantee of success in case of V model is hight whereas the waterfall model is more prone to failures.

Consider a situation where the time is very less to develop a software. Requirement specification are clear at the early stage and the plan is ready about how development is going to take place in stages, responsibilities of each team member is assigned and deadline of each stage is set. In this case waterfall model is best as the chances of happening errors are less in each stage but if there are chances that a fault may have a chance to arise during the development phase then going for V model is best. As in case of waterfall model you have to start from the very first stage because testing happen after development which is not in case of V model.