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<p>A recent paper compared several axiomatic methods of formal specification, one of which was Z. As a result of a comparison made between Z and a similar, but executable, specification language called me too, Simon Finn pointed out that one of the Z specifications given in that paper was not correct. This correspondence describes the erroneous function and draws some conclusions about the process of formal specification.</p>
Formal specification, prototyping.

H. Alexander, "Comments on "Formal Specification of User Interfaces: A Comparison and Evaluation of Four Axiomatic Approaches"," in IEEE Transactions on Software Engineering, vol. 14, no. , pp. 438-439, 1988.
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