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This scheme is introduced in the following section and is followed by examples for its application in Sect. 3. 1 Fine-Grained Classification Scheme In this section, a fine-grained classification scheme is introduced that considers the possible variations of the systems, the potential changes of models, and the variations in the respective formalisms. To begin with, Fig. 2 shows an overview of the identified types of transformations. As the reader can observe, we have chosen a very simple scheme for naming the different types of transformations by following the graphical layout of the figure, which should be easy to remember.

Our approach allows a rather flexible treatment of the communication since the UMS main loop (Fig. 2) can be modified as necessary. For example, our explicit way of modeling the communication links and the messages exchanged over them allows modeling exterior influence on the communication within a system (such as attacks on insecure connections, or quality-of-service aspects of networks). outQuA outQuA := ∅ Fig. 1. Behavior of a UML Machine 40 Jan Jürjens and Pasha Shabalin Definition 3. A UML Machine System (UMS) A = (NameA , CompA , SchedA , LinksA , MsgsA ) is given by • a name NameA ∈ UMNames, • a finite set CompA of UML Machines called components, • a UML Machine SchedA , the scheduler that may call the components as subroutines, • a set LinksA of two-element sets l ⊆ CompA , the communication links between them, and • a set of messages MsgsA ⊆ MsgNm that the UML Machine System is ready to receive.

The infinite queues are approximated by finite queues. Especially in reactive systems that are executed on hardware platforms with only small data memories, memory overflows can easily occur that cannot be attributed to an error in the specification. D. thesis ([353], pp. 179–180), depicts this situation in more detail (see Fig. 6). Using the timer perT, the sensor process periodically measures a certain physical value that is sent to the logger process. Initially this process is in the producerA a) consumer go go producerB producerA b) sigB /* lost */ idle sigA consumer go go producerB idle sigA receiving receiving sigB Fig.

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