Process algebra with partial choice.

The objective of this paper is to bridge the gap between ACP and TCSP. To this end, ACP is extended with two non-deterministic choice operators in a setting of bisimulation semantics. With these operators, we can express safety properties of systems without the use of silent steps, and we can verify safety properties in a setting in which no assumption on fairness (or unfairness) has been made. [ABSTRACT FROM AUTHOR]