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Lookup NU author(s): Dr Rogerio De Lemos,
Dr Amer Saeed,
Emeritus Professor Tom Anderson
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Requirements analysis plays a vital role in the development of safety-critical systems since any faults in the requirements specification will corrupt the subsequent stages of system development. Experience in safety-critical systems has shown that faults in the requirements can and do cause disasters. The analysis of the safety requirements of a train set system is discussed in terms of a general framework for the requirements analysis of safety-critical systems. This framework is based on the clear separation of the mission and safety issues, and also on the separation of the analysis, into two phases, to be performed in terms of the properties of the real world, i.e. physical laws and rules of operation, and the properties of the system, i.e. the mapping of the real world properties in terms of the system sensors and actuators. Due to the different expressive needs of the two phases we propose the utilisation of different formal models, respectively, a logical formalism (Timed History Logic) and a net formalism (Predicate-Transition nets).
Author(s): de Lemos R, Saeed A, Anderson T
Publication type: Article
Publication status: Published
Journal: The Computer Journal
ISSN (print): 0010-4620
ISSN (electronic): 1460-2067
Publisher: Oxford University Press
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