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Tests represent a sample of all possible situations the system under design can go through. In almost all cases, the number of all possible situations is so large it is impossible to design a system that can perform equally in all situations. Therefore, tests are not so effective in this regard but they can improve the design greatly. Most designers adopt the gradual improvement philosophy where the first design is made as perfect and possible and then they learn of any flaws during the actual use of the system and correct them in future designs.

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