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An early start to testing reduces the cost and time to rework and produce error-free software that is delivered to the client.However in Software Development Life Cycle (SDLC), testing can be started from the Requirements Gathering phase and continued till the deployment of the software.It also depends on the development model that is being used.For example, in the Waterfall model, formal testing is conducted in the testing phase; but in the incremental model, testing is performed at the end of every increment/iteration and the whole application is tested at the end.
Testing is done in different forms at every phase of SDLC: It is difficult to determine when to stop testing, as testing is a never-ending process and no one can claim that a software is 100% tested.
The following aspects are to be considered for stopping the testing process: These two terms are very confusing for most people, who use them interchangeably. Verification Validation 1 Verification addresses the concern: "Are you building it right?