Statecharts: A visual formalism for complex systems
Science of Computer Programming
STATEMATE: A Working Environment for the Development of Complex Reactive Systems
IEEE Transactions on Software Engineering
Modeling Reactive Systems with Statecharts: The Statemate Approach
Modeling Reactive Systems with Statecharts: The Statemate Approach
Verification of a Radio-based signaling system using the STATEMATE verification environment
Formal Methods in System Design
Knowledge-Based Technology for Controlling Railway Stations
IEEE Expert: Intelligent Systems and Their Applications
Instantiating generic charts for railway interlocking systems
Proceedings of the 10th international workshop on Formal methods for industrial critical systems
Statecharts Composition To Model Topologically Distributed Applications
Journal of Integrated Design & Process Science
Original article: A component-based topology model for railway interlocking systems
Mathematics and Computers in Simulation
Design and validation of variability in product lines
Proceedings of the 2nd International Workshop on Product Line Approaches in Software Engineering
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The development of computer controlled Railway Interlocking Systems (RIS) has seen an increasing interest in the use of Formal Methods, due to their ability to precisely specify the logical rules that guarantee the safe establishment of routes for trains through a railway yard. Recently, a trend has emerged about the use of statecharts as a standard formalism to produce precise specifications of RIS. This paper describes an experience in modelling a railway interlocking system using statecharts. Our study has addressed the problem from a ''geographical'', distributed, point of view: that is, our model is composed by models of single physical entities (points, signals, etc.) that collectively implement the interlocking rules, without any centralized database of rules, which is on the other hand a typical way of implementing such a system (what we call ''functional'' approach). One of the main aims of our approach, is to verify its ability to reduce revalidation efforts in the case of physical modifications to the yard; we show how the geographical approach may reduce this effort by requiring only the revalidation of those software modules that are actually affected by the changes.