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Operations on action systems may be defined corresponding to CSP hiding and renaming. These are of particular use in describing the refinement between action systems in which the granularity of actions is altered. We derive a simplified expression for hiding sets of actions and present sufficient conditions for forwards simulation in which the concrete system uses hiding and renaming. Both of these reduce the complexity of proofs of refinement. We present a case study in specification and refinement using action systems which makes use of the operations and refinement rules previously defined.

Event refinement in state-based concurrent systems