IT Service Alignment Verification of Quantitative Properties in Service Design

Despite many years of research, alignment of business and IT services remains a challenge. In this paper we show how to verify the quantitative properties of a service against stakeholder requirements during service design. We model the service with the Systemic Enterprise Architecture Method (SEAM). This allows us to specify the service alignment constraints with what we call a feasibility constraint. We translate the SEAM model into Scala code, where the feasibility constraint is mapped to a constraint of a Scala function. We then check the Scala function’s verification condition with the Leon verification tool. An alignment is achieved if no counterexample is found. If a counterexample exists, it allows to detect which service component is at the source of the misalignment

Observational models of requirements evolution

Requirements Evolution is one of the main issues that affect development activities as well as system features (e.g., system dependability). Although researchers and practitioners recognise the importance of requirements evolution, research results and experience are still patchy. This points out a lack of methodologies that address requirements evolution. This thesis investigates the current understanding of requirements evolution and explores new directions in requirements evolution research. The empirical analysis of industrial case studies highlights software requirements evolution as an important issue. Unfortunately, traditional requirements engineering methodologies provide limited support to capture requirements evolution. Heterogeneous engineering provides a comprehensive account of system requirements. Heterogeneous engineering stresses a holistic viewpoint that allows us to understand the underlying mechanisms of evolution of socio-technical systems. Requirements, as mappings between socio-technical solutions and problems, represent an account of the history of socio-technical issues arising and being solved within industrial settings. The formal extension of a heterogeneous account of requirements provides a framework to model and capture requirements evolution. The application of the proposed framework provides further evidence that it is possible to capture and model evolutionary information about requirements. The discussion of scenarios of use stresses practical necessities for methodologies addressing requirements evolution. Finally, the identification of a broad spectrum of evolutions in socio-technical systems points out strong contingencies between system evolution and dependability. This thesis argues that the better our understanding of socio-techn..

Event-B モデルの詳細化構造の計画とリファクタリングの支援手法

学位の種別: 課程博士審査委員会委員 : （主査）東京大学准教授 蓮尾 一郎, 東京大学教授 萩谷 昌己, 東京大学教授 小林 直樹, 東京大学教授 高野 明彦, 東京大学教授 千葉 滋University of Tokyo(東京大学