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  issues, patches are released. Also to enhance the product some better versions are released. That’s why, maintenance is done to deliver these changes in the customer environment. Validation Phases The different validation phases in the V-Model are explained in details below:-   1.      Unit Testing Unit tests designed in the module design phase are executed on the code during this validation phase. Unit testing is the testing at code level and helps eliminate bugs at an early stage, though all defects cannot be uncovered by unit testing.   2.      Integration Testing After completion of unit testing Integration testing is performed. In integration testing, the modules are integrated and the system is tested. Integration testing is performed on   the Architecture design. This test verifies the communication of modules among themselves.   1.      System Testing System testing is directly associated with the system design phase. System tests check the entire system fun

1.    Compare Waterfall Model vs. V Model (Difference & Similarities) Waterfall Model The waterfall model is a breakdown of project activities into linear sequential phases, where each phase depends on the deliverables of the previous one and corresponds to a specialization of tasks. It is also called a classical model used in system development life cycle to create a system with a linear and sequential approach. It is termed as waterfall because the model develops systematically from one phase to another in a downward way. All these phases are cascaded to each other in which progress is seen as flowing steadily downwards (like a waterfall) through the phases. The next phase is started only after the defined set of goals are achieved for previous phase and it is signed off, so the name "Waterfall Model". Let’s take a look at an example of a software engineering project plan using a waterfall model. In this example, we’ve scoped out tasks for adding a new app feature.