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A lower degree of testability results in increased [[test effort]]. In extreme cases a lack of testability may hinder testing parts of the software or [[software requirements]] <u>at all</u>.
In order to link the testability with the difficulty to find potential faults in a system (if they exist) by testing it, a relevant measure to assess the testability is how many test cases are needed in each case to form a complete test suite (i.e. a test suite such that, after applying all test cases to the system, collected outputs will let us unambiguously determine whether the system is correct or not according to some specification). If this size is small, then the testability is high. Based on this measure, a [[
== Background ==
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