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Description:
Assertions or more generally "Programming by contract" have gained widespread acceptance in the computer science community as a means for correct program development. However, the literature lacks an empirically evaluation of the benefits a programmer gains by using assertions in his software development. This paper reports about two controlled experiments to close this gap. Both experiments compared "Programming by contract" to the traditional programming style without assertions. The evaluation suggests that assertions tend to decrease the programming effort and that assertions lead to more reliable programs compared to those programs written without using them.