A probabilistic calculus, derived from Milner's SCCS, WSCCS is
presented. We define a notion of bisimulation for probabilistic
processes and show that it is a congruence. A simple equational
characterisation is shown to be both sound and complete for finite
processes. We present many examples including some extended ones. The
larger examples show both the expressive power of WSCCS and the
availability of simple proof methods for some complex systems.
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