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The presented software development process is based on extended timestamp nets (Petri net with an underlying time concept) and a logic of actions which allows us to specify processes. By means of an example, the phases of the development process are discussed and the most important terms of the theory are explained. Since we can do direct and indirect proofing in the logic, we verify the developed controller with respect to process-like specifications. Moreover, situation-like specifications can be tested. In this way, we put the machine virtually into operation.