"One of the first discoveries of the research by the Z team" C.A.R. Hoare

 "One of the first discoveries of the research by the Z team was the necessity of separating small chunks of formal material by paragraphs of informal prose, explaining the relationship between the formal symbols and reality, and motivating the decisions that are captured by the formalisation.
The drafting of the informal prose was even more difficult to teach, learn and practice than the mastery of mathematical notations and concepts. "  

C.A. R. Hoare, Préface à VDM'90, VDM and Z - Formal Methods in Software Developemnt, LNCS,  ISBN 3-540-52513-0

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