On the construction of multiphase communication protocols

The complexity of communication protocols has led to compositional techniques to design and verify protocols. We propose a framework for sequential composition of protocols. We identify two types of interactions, ordering and inhibition, required to specify such compositions. By describing these interactions separately, our framework enhances the applicability to the technique to a larger class of protocols. The technique facilitates modular design and verification. We illustrate the use of our technique by deriving several protocols.