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Formal methods to spozify and verify concurrent programs with synchronous message passing are discussed. We stress the development towards compositional methods, i.e. methods in which the specification of a compound program can be inferred from specifications of its constituents without reference to the internal structure of those parts. Compositionality enables verification during the process of (top-down) design -the derivation of correct programs -instead of the more familiar a-posterioridoi:10.1007/bf02811338 fatcat:xw2ptfdyonfjjd4pucfqzkbjiu