Suchergebnisse

The verification of safety requirements becomes crucial in critical systems where human lives depend on their correct functioning. Formal methods have often been advocated as necessary to ensure the reliability of software systems, albeit with a considerable effort. In any case, such an effort is cost-effective when verifying safety-critical systems. Often, safety requirements are expressed using safety contracts, in terms of assumptions and guarantees. To facilitate the adoption of formal methods in the safety-critical software industry, we propose a methodology based on well-known modelling languages such as the unified modelling language and object constraint language. The unified modelling language is used to model the software system while object constraint language is used to express the system safety contracts within the unified modelling language. In the proposed methodology a unified modelling language model enriched with object constraint language constraints is transformed to a Petri net model that enables us to formally verify such safety contracts. The methodology is evaluated on an industrial case study. The proposed approach allows an early safety verification to be performed, which increases the confidence of software engineers while designing the system ; The research of the authorswas supported in part by theARTEMISJoint Undertaking under grant agreement no. 295373 (project nSafeCer) and by National funding. The research of Ricardo J. Rodríguez was also supported in part by EU Horizon 2020 research and innovation programme under grant agreement no. 644869 (DICE) and by Spanish MINECO project CyCriSec (TIN2014-58457-R). The research of Clara Benac Earle was also supported by Spanish MINECO project STRONGSOFT (TIN2012-39391-C04-02) and by the Madrid Regional Government project nGreens (S2013/ICE-2731)