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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.
Research is a tool by which they can test their own, and each others' theories, by using this antagonism to find an answer and advance knowledge. The purpose of research is really an ongoing process of correcting and refining hypotheses, which should lead to the acceptance of certain scientific truths. Whilst no scientific proof can be accepted as ultimate fact, rigorous testing ensures that proofs can become presumptions.