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This paper describes a compositional approach to generate the labeled transition system representing the behavior of a Lotos program by repeatedly alternating composition and reduction operations on subsets of its processes. To restrict the size of the intermediate Ltss generated, we generalize to the Lotos parallel composition operator the results proposed… (More)
This paper describes decision procedures for bisimulation and simulation relations between two transition systems. The algorithms proposed here do not need to previously construct them: the veriication can be performed during their generation. In addition, a diagnosis is computed when the two transitions systems are not equivalent.
Formal Description Techniques (fdt), such as lotos or sdl are at the base of a technology for the speciication and the validation of telecommu-nication systems. Due to the availability of commercial tools, these formalisms are now being widely used in the industrial community. Alternatively, a number of quite eecient veriication tools have been developed by… (More)
This paper presents the tools ALDEBARAN, CESAR, CESAR.ADT and CLEOPATRE which constitute a tool- box for compiling and verifying LOTOS programs. The principles of these tools are described, as well as their performances and limitations. Finally, the formal verification of the ret/REL atomic multicast protocol is given as an example to illustrate the… (More)
In this paper we propose some extensions necessary to enable the speci-cation and description language SDL to become an appropriate formalism for the design of real-time and embedded systems. The extensions we envisage concern both roles of SDL: First, in order to make SDL a real-time speciication language, allowing to correctly simulate and verify… (More)
This paper presents an architecture for model-based testing using a profile of the Unified Modeling Language (UML). Class, object, and state diagrams are used to define essential models: descriptions that characterise the entire range of possible behaviours, in terms of the actions and events of the model. Object and state diagrams are used to introduce… (More)