Specification and Transformation of Reactive Systems with Time Restrictions and Concurrency

In this paper the most difficult step of a method is presented by which requirements in the duration calculus (DC) can be transformed into occam programs such that the implementation is correct by construction. Several rules for correct transformations from DC towards an important intermediate stage, the specification language SL time , will be shown. In particular we shall explain the interplay between requirements and a control program, the introduction of parallelism and the change from the state based DC-description to the event based SL time description