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1 As it not possible makes it software application is defect free but testing will be necessary. 2  Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment. Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment.
Thus in the area of pre and post testing of students it is important to realise that one must be prepared to make only very limited claims for any findings which seek to provide an accurate measure of the change in learning which can be attributed to the intervention.