Abstract
The paper concerns automatic generation of usage models from real-time software UML models. Firstly, we define the reasonably constrained real-time software UML artifacts, which include use case diagrams, timed sequence diagrams and the execution probability of each sequence diagram in its associated use case. Secondly, the paper presents a method that derives the software usage model from the constrained UML artifacts. The method elicits the messages associated with the objects under testing and their occurrence probabilities to generate the usage model of each use case. Timing constraints in sequence diagrams are considered during usage model generation. Then the usage models of use cases are integrated into the software usage model by utilizing the execution sequence relations between use cases. The usage models can be used to generate real-time software statistical test cases and facilitate real-time software statistical testing.
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