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Dezyne is based on a message passing programming model. Messages are explicitly represented in the language and expressed in the underlying process algebra. The approach allows reasoning about equivalences which in turn is used in verification and allows compositions to retain their individually verified properties.
Message passing is a natural way of describing concurrency, from cooperative multitasking to multi threading and multi processing. It abstracts away from cumbersome primitives like semaphores, mutexes, condition variables, critical sections, etc. It also removes the passing of time completely and focuses our reasoning on the ordering of messages. Which allows combining synchronous and asynchronous activity in a single formalism.
Multi tasking vs parallelism.