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The huge gap between the requirements and the system model is an obstacle to the application of formal methods in industry. To reduce this gap, as well as to enhance the consistency and completeness before implementation, we proposed an approach integrating Simulink/Stateflow and Atelier B for developing the tram control system. The Simulink/Stateflow was used to quickly model the requirements for the system. Moreover, we analysed and debugged the logic of the system with the fast-iterative simulation of Simulink/Stateflow. Afterwards, we outlined the analysis in which the B architecture is chosen and manually built the B model according the process flows of the Stateflow model, to further explore through proof of safety invariants. Finally, we introduced the approach by developing the point controlling module of our projects. In this paper, following the approach we presented, not only can the consistency between the requirements and formal specification be improved, but the safety of system model is strengthened.

DEVELOPING THE TRAM CONTROL SYSTEM BASED ON SIMULINK/STATEFLOW AND B METHOD