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Test and Evaluation is the process by which a system or components are compared against requirements and specifications through testing. The results are evaluated to assess progress of design, performance, supportability, etc. Developmental test and evaluation is an engineering tool used to reduce risk throughout the acquisition cycle. Operational test and evaluation is the actual or simulated employment, by typical users, of a system under realistic operational conditions.
Testing is a mechanism to assure quality of a product, system. To be effective, testing cannot occur only at the end of a development. It must be addressed continuously throughout the entire life cycle.
Test and Evaluation involves evaluating a product from the component level, to stand-alone system, integrated system, and, if appropriate, system-of-system and enterprise.
