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Seamless development of complex systems : a multirequirements approach

Abstract : Proving that a system satisfies its requirements is an important challenge of Requirements Engineering. On the one hand, formal approaches provide a way to express requirements mathematically and prove that a system satisfies its requirements. However, if formalization offers additional possibilities such as verification, or even validation, it often proves to be too difficult to use in practice by the stakeholders involved in the development of systems. On the other hand, in most cases, requirements are written and sometimes traced in Natural Language for communication and mutual understanding purposes. Moreover, this remains during the whole development process. Thus, it is necessary to consider the need to address all these stakeholders during the development process. The main objective of this thesis is to provide a seamless methodology that allows benefiting from the formalization of requirements while being understandable by all stakeholders. We propose an approach that considers requirements as parts of the system's code, which, as such, contributes to improving quality assessment. In addition, integrating the requirements into the code guarantees a seamless development. The contributions target three main benefits. First, there is no need to switch from one tool or environment to another: a single framework supports the development from analysis to implementation. Second, changes and reversibility become a regular occurrence, directly supported by the method, language, and tools, facilitating round-trips. Third, the different levels of abstraction remain inside the object-oriented paradigm. We apply this vision to the development process itself with the same expected advantages. The development life-cycle can then benefit from this strong integration of requirements into the code. These artifacts help in software development by providing support and guidelines for analysis or decision support and reinforcing the software quality. Besides, reusability, evolutivity, and maintainability are enhanced. Traceability between requirements and code allows an easy impact analysis when any of these artifacts evolve. However, if this paradigm is familiar to developers and even if we put an effort in providing expressivity, they are not addressed to other stakeholders that used to work with several tools. Since we also want non-experts to use our approach to validate systems in the early stage of their development, we propose a Domain-Specific Language: (i) close to natural language and (ii) based on formal semantics. Using Model-Driven Engineering techniques, this language bridges the gap between the several stakeholders involved in a project (considering their different backgrounds) and between the requirements and the code. We finally put a research effort into defining relationships between requirements. We provide their formal definitions and properties on the propagation of the satisfaction state. These definitions can help engineers verify requirements (by checking the validity of the semantics of the relationships between two requirements) and verify the system compliance (thanks to satisfaction propagation). This work is a step towards introducing formal semantics into traceability, making it possible to automatically analyze requirements and use their relationships to verify the corresponding implementation of the system.
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Submitted on : Monday, March 7, 2022 - 10:40:26 AM
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  • HAL Id : tel-03599456, version 1

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Florian Galinier. Seamless development of complex systems : a multirequirements approach. Software Engineering [cs.SE]. Université Paul Sabatier - Toulouse III, 2021. English. ⟨NNT : 2021TOU30130⟩. ⟨tel-03599456⟩

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