Segui le ultime notizie e i progetti sulla Covid e la risposta della Commissione europea al coronavirus. To stay in business in the long term, it is foreseen that it will be necessary to be able to master rigorous techniques in the development of security and safety related systems. In particular since the complexity of the critical software is increasing. One of the main problems we have at the moment with our software development is that the currently used informal methods do not promote the early detection of faults during the development. The majority of faults are consequently discovered late. The cost of their correction is therefore higher, and the development life cycle is too long.
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PICGAL: Practical use of formal specification to develop a complex critical system

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This paper reports on the experiment PICGAL which aims to assess the benefits of using VDM to develop high reliability related software in the space industry in a practical way. The application used in this project is a code generator from a next generation environment to be used in the development of ground application software for boosters such as ARIANE V. The experiment is constructed as a parallel development of the code generator; using the conventional approach and using formal specification. This allows detailed measurements of the effects resulting from the introduction of VDM. This work is adding to the existing body of evidence of the effect of using a moderate amount of formal methods in an industrial context in a new critical domain. This paper provides an overview of the domain, the application and it shows how the formal specification has been structured. Finally, results and key lessons are presented.
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