Abstract
This article proposes entity-life modeling as a way to design concurrent control system software. Multiple threads of control in the software are modeled on threads of events in the problem environment, and software objects are modeled on objects in the problem. The threads of events can often be seen as the lives of entities that compete for access to shared resources. This situation is directly captured in the software by means of threads of control competing for exclusive access to objects. Entity-life modeling is illustrated by means of a flexible manufacturing system designed in Ada.
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