From UML To B – A Level Crossing Case Study
Author(s)
J.-L. Boulanger, P. Bon & G. Mariano
Abstract
The goal of this paper is to show how it is possible to combine the advantages
of Unified Modelling Language (UML) and of the B method in order to design
safety applications. We investigate how the Unified Modeling Langage (UML),
can be used to formally specify and verify critical railways systems. A benefit of
using UML is it status as an international standard (OMG) and its widespread use
in the software industry. B is a formal method for the incremental development of
specifications and their refinements down to an implementation. In the railway
critical software domain, safety requirements are obviously severe. It is very
important to keep requirements traceability during software development process
even if the different used models are informal, semi formal or formal.
Keywords: B method, formal development, level crossing, software verification.
1 Introduction
In spite of progress carried out in software development, designing a complex
system while respecting its safety requirements, remains very hard. During the
critical software development process, safety and security requirements must be
traced from informal specification to code generation. So we need to trace them
in the different models: informal, semi formal or formal ones. We present a new
method here to transform a semi formal modelling to a formal specification which
enables them to be traced. This method will be applied to a railways case study,
where safety requirements are very strict. We study a level crossing case study
taking into account French particularities. This article is made up 3 parts. Firstly,
we describe the case study. In the following part we present the principles of UML
and we give a part of semi formal modelling of the level crossing. In the last part
Keywords
B method, formal development, level crossing, software verification.
Related Book
Other papers in this volume
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