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Verification and validation3 [is] a general term for the complete range of checks that are performed on a system in order to increase confidence that the system is suitable for its intended purpose. This range might include a rigorous set of functional tests, performance testing, reliability testing, and so on, in which case the term verification, validation and testing is more appropraite. Although a precise distinction is not always drawn, the verification aspects normally refers to completely objective checking of conforming to some well-defined specification, while the validation aspect normally refers to a somewhat objective assessment of likely suitability in the intended environment.