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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.
For example, if the acceptable level of detection risk decreases, more assurance is required from substantive tests As the acceptable level of detection risk increases, the assurance (effectiveness) that must be provided from substantive tests can decrease.