Formal Development of Real-time Systems with PLOT/MASS

The paper presents a formal development process of a real-time system. We employ two related languages: the real-time logic plot for plant modeling and requirements speciication, and the real-time language mass for the controller design. A deductive proof system is used to verify the design against the requirements. The examples given in the paper demonstrate the special features of the mass/plot framework that make it especially suitable for real-time systems speciication. In particular, we show explicit expression of causality and timing in plot, modular design by reenement in mass, and the succinct and intuitive nature of speciications in this framework.