elationships between heterogeneous models at different levels of abstraction. In particular, they can be used to represent design transformations from tightly synchronized specifications to loosely-synchronized implementations. The theory has an important application in the correct-byconstruction deployment of synchronous design on distributed architectures. Categories and Subject Descriptors: C.3.0 [Special-Purpose and Application-Based Systems]:
Albert Benveniste, Benoît Caillaud, Luca P.