Systematic software development using VDM (2nd ed.)
Systematic software development using VDM (2nd ed.)
The Z notation: a reference manual
The Z notation: a reference manual
Object-oriented analysis and design with applications (2nd ed.)
Object-oriented analysis and design with applications (2nd ed.)
The IFAD VDM-SL toolbox: a practical approach to formal specifications
ACM SIGPLAN Notices
Computer
ACM Transactions on Programming Languages and Systems (TOPLAS)
On the criteria to be used in decomposing systems into modules
Communications of the ACM
Logic and Specifiction: Extending VDM-SL for Advanced Formal Specification
Logic and Specifiction: Extending VDM-SL for Advanced Formal Specification
Composition and Refinement in the B-Method
B '98 Proceedings of the Second International B Conference on Recent Advances in the Development and Use of the B Method
Introducing Dynamic Constraints in B
B '98 Proceedings of the Second International B Conference on Recent Advances in the Development and Use of the B Method
Synchronized Parallel Composition of Event Systems in B
ZB '02 Proceedings of the 2nd International Conference of B and Z Users on Formal Specification and Development in Z and B
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Decomposition and refinement provide a way to master the complexity of system specification and development. Decomposition allows us to describe a complex system in term of simpler and more understandable components and in terms of the interactions between these components. Refinement/Abstraction allows us to use more general specifications, which should also be more understandable, and which can be gradually made more precise. Combining decomposition and refinement offers a very powerful tool to build specifications. This process results in a structured object which describes both the final specification and its elaboration in term of interaction and refinement. Nevertheless the result remains intrinsically a complex object. The next step consists in developing tools to represent, to manipulate and to reason about such structured objects. The aim of this paper is to propose such a tool in the framework of the B method. By exploiting the B theory, and as far as possible without changing the method, we propose three algorithms to extract validated B components, using properties underlying the structure of developments. These new components can be exploited to extend a structured development, for instance to validate new properties.