Overview of the Semantics of TCOZ

Object-Z is an extension to the Z language designed to facilitate spec-iication in an object-oriented style. It is an excellent tool for modelling data and operations, but its object semantics are single threaded, operations are atomic, and object control logic is deened implicitly. This makes it diicult to use Object-Z to capture the behaviour of concurrent real-time reactive systems. On the other hand, Timed CSP is good at modelling real-time concurrent behaviour, but has little support for modelling the state of a complex system. This paper describes the semantics of TCOZ, a language blended from Object-Z and Timed CSP. The semantic model adopted is the innnite timed failures model of Timed CSP, extended to include initial state and update events for modelling operations on internal state.