Software testing is performed to fulfil the following objectives:

Software quality means that conformance to the specified software design requirements are met. It includes as
•    Being correct
•    Minimum requirement of quality
•    Performing as required under specified circumstances.
      
        Nowadays computers and software are used in critical applications, the outcome of a bug can be sever. Examples:
•    Caused airplane crashes.
•    Allowed space shuttle missions to go away
•    Halted trading on the stock market.
•    Y2K

Testing can serve as metrics. It is heavily used as a tool in the verification and validation process. Tester can make claim based on interpretation of the testing results, which either the product works under certain situations, or it does not work.

Software verification is the process of evaluating a system or component to determine whether the products of a given development phase satisfy the conditions ignored at the start of that phase.

Software validation is the process of evaluating a system or component during or at the end of the development process to determine whether it satisfies specified requirements.

The objective of testing is to discover the residual design errors before delivering to the customer. The failure data during the testing process are taken in down to estimate the software reliability. The testing process may function with regular feedback from the reliability analysis to the testes and designers.



Based on an operational profile, testing can serve as a statistical sampling method to join failure data for software reliability estimation.

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