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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.
A test may be defined by some asvalid if research demonstrates that the test can predict an outcome somewhat more accurately than arandom procedure. However, most scientists also consider many other factors in evaluating validity --test structure, research design, and consequences of use.