Proc. of the European symposium on programming on ESOP 86
The Z notation: a reference manual
The Z notation: a reference manual
Specification and transformation of programs: a formal approach to software development
Specification and transformation of programs: a formal approach to software development
Using Z: specification, refinement, and proof
Using Z: specification, refinement, and proof
The B-book: assigning programs to meanings
The B-book: assigning programs to meanings
Proceedings of the 10th International Conference of Z Users on The Z Formal Specification Notation
ZUM '97 Proceedings of the 10th International Conference of Z Users on The Z Formal Specification Notation
FME '97 Proceedings of the 4th International Symposium of Formal Methods Europe on Industrial Applications and Strengthened Foundations of Formal Methods
ZUM '97 Proceedings of the 10th International Conference of Z Users on The Z Formal Specification Notation
More Powerful Z Data Refinement: Pushing the State of the Art in Industrial Refinement
ZUM '98 Proceedings of the 11th International Conference of Z Users on The Z Formal Specification Notation
Consistency and Refinement for Partial Specification in Z
FME '96 Proceedings of the Third International Symposium of Formal Methods Europe on Industrial Benefit and Advances in Formal Methods
Class Refinement and Interface Refinement in Object-Oriented Programs
FME '97 Proceedings of the 4th International Symposium of Formal Methods Europe on Industrial Applications and Strengthened Foundations of Formal Methods
Viewpoint Consistency in Z and LOTOS: A Case Study
FME '97 Proceedings of the 4th International Symposium of Formal Methods Europe on Industrial Applications and Strengthened Foundations of Formal Methods
Coupling schemas: data refinement and view (point) composition
2FACS'97 Proceedings of the 2nd BCS-FACS conference on Northern Formal Methods
2FACS'97 Proceedings of the 2nd BCS-FACS conference on Northern Formal Methods
Retrenchment, Refinement, and Simulation
ZB '00 Proceedings of the First International Conference of B and Z Users on Formal Specification and Development in Z and B
Loose Specification and Refinement in Z
ZB '02 Proceedings of the 2nd International Conference of B and Z Users on Formal Specification and Development in Z and B
Systems Development Using Z Generics
FM '99 Proceedings of the Wold Congress on Formal Methods in the Development of Computing Systems-Volume II
FM '99 Proceedings of the Wold Congress on Formal Methods in the Development of Computing Systems-Volume II
Minimally and Maximally Abstract Retrenchments
IFM '02 Proceedings of the Third International Conference on Integrated Formal Methods
A rigorous environment for development of concurrent systems
Nordic Journal of Computing
Engineering and theoretical underpinnings of retrenchment
Science of Computer Programming
Modelchecking Correctness of Refactorings - Some Experiments
Electronic Notes in Theoretical Computer Science (ENTCS)
Electronic Notes in Theoretical Computer Science (ENTCS)
ASM'03 Proceedings of the abstract state machines 10th international conference on Advances in theory and practice
Using coupled simulations in non-atomic refinement
ZB'03 Proceedings of the 3rd international conference on Formal specification and development in Z and B
Non-atomic refinement in z and CSP
ZB'05 Proceedings of the 4th international conference on Formal Specification and Development in Z and B
From ODP viewpoint consistency to Integrated Formal Methods
Computer Standards & Interfaces
Translation of Z specifications to executable code: Application to the database domain
Information and Software Technology
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We present a generalisation of data refinement in Z, called IO-refinement, that allows changes in input and output parameters of operations. Several informal motivations for the desirability of such a refinement relation are given, followed by a formal derivation that demonstrates its theoretical soundness. It is proved that IO-refinement indeed generalizes data refinement. Several theorems are presented that give sufficient conditions for IO-refinement to hold in simpler situations, e.g. just adding inputs and outputs. Some examples of the use of IO-refinement are also given.