Controlling Control Systems: An Application of Evolving Retrenchment
ZB '02 Proceedings of the 2nd International Conference of B and Z Users on Formal Specification and Development in Z and B
Requirement enforcement by transformation automata
Proceedings of the 6th workshop on Foundations of aspect-oriented languages
Engineering and theoretical underpinnings of retrenchment
Science of Computer Programming
Tracing integration analysis in component-based formal specifications
FMOODS'05 Proceedings of the 7th IFIP WG 6.1 international conference on Formal Methods for Open Object-Based Distributed Systems
Retrenchment and the b-toolkit
ZB'05 Proceedings of the 4th international conference on Formal Specification and Development in Z and B
Retrenchment: extending refinement for continuous and control systems
IW-FM'00 Proceedings of the 4th Irish conference on Formal Methods
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Discussion of a simple example demonstrates various expressive limitations of the refinement calculus, and suggests a liberalization of refinement, called retrenchment, which will support an analogous formal development calculus. Useful concrete system behavior can be specified outside the domain of pure refinement, and a case is made for fluidity between I/O and state components across the development step.A syntax and a formal definition are presented for retrenchment, which has some necessary properties for a formal development calculus: transitivity gives stepwise composition of retrenchments, and monotonicity w.r.t. the specification language constructors gives piecewise construction of retrenchments.