In this paper we define a combination of Object-Z and CSP called CSP-OZ. The basic idea is to define a CSP-semantics for every Object-Z class. Special care is taken to capture the characteristics of input and output parameters properly and to preserve the expected refinement rules.CSP-OZ is well suited for the specification and development of communicating distributed systems. It provides powerful techniques to model dataand control-aspects in a common framework. The language is easy to use for Z and Object-Z users.

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