We propose a development framework that extends the scope of structured review by supplementing the structured review with model-based verification. The proposed approach uses the Unified Modeling Language (UML) as a modeling notation. We discuss a set of correctness arguments that can be used in conjunction with formal verification and validation (V&V) in order to improve the quality and dependability of systems in a cost-effective way. Formal methods can be esoteric; consequently, their large scale application is hindered. We propose a framework based on the integration of lightweight formal methods and structured reviews. Moreover, we show that structured reviews enable us to handle aspects of V&V that cannot be fully automated. To demonstrate the feasibility of our approach, we have conducted a study on a security-critical system - a patient document service (PDS) system.

Convenience in specification and possibility for formal analysis are, to some extent, exclusive aspects of system specification. This paper describes an approach that emphasizes both aspects, by combining UML with a language for observable behavior of interfaces, OUN. These are complementary in the sense that one is graphical and semi-formal while the other is textual and formal. The approach is demonstrated by a case study.