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Software Architecture Evolution and the Chemical Abstract Machine

The Chemical Abstract Machine (CHAM) is a general-purpose, simple, intuitive and operational programming model that has been used for the speciication and analysis of the computational behaviour of software architectures. It therefore seems to be a good candidate to describe also the dynamics of the architecture itself and the coordination between the two processes. We also explore the ability of the CHAM to help establish the principles of software architecture evolution by encoding diierent approaches within the same framework.