History
The assertional method for proving correctness of programs was advocated by Alan Turing. In a talk "Checking a Large Routine" at Cambridge, June 24, 1950 Turing suggested: "How can one check a large routine in the sense of making sure that it's right? In order that the man who checks may not have too difficult a task, the programmer should make a number of definite assertions which can be checked individually, and from which the correctness of the whole program easily follows."
Read more about this topic: Assertion (computing)
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