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Requirements and testing belong together. Historically, testers have often seen the requirements only after the system has already been partially implemented. This had two serious disadvantages. On the one hand, insufficient requirements quality came far too late to the table. On the other hand, it was quite a lot of extra work without deriving suitable test cases in the context of the requirements definition. A lot of additional work and long correction loops were the result.
Ebert et al. (Wed,) studied this question.