Contains the refereed proceedings of the Third International Conference of Z and B Users, ZB 2003, held in Turku, Finland in June 2003. This book documents the advances for the Z formal specification notation and for the B method, spanning the full scope from foundational, theoretical, and methodological issues to advanced applications and tools.

Alloy: A Logical Modelling Language.- An Outline Pattern Language for Z: Five Illustrations and Two Tables.- Patterns to Guide Practical Refactoring: Examples Targetting Promotion in Z.- Reuse of Specification Patterns with the B Method.- Composing Specifications Using Communication.- When Concurrent Control Meets Functional Requirements, or Z + Petri-Nets.- How to Diagnose a Modern Car with a Formal B Model?.- Parallel Hardware Design in B.- Operation Refinement and Monotonicity in the Schema Calculus.- Using Coupled Simulations in Non-atomic Refinement.- An Analysis of Forward Simulation Data Refinement.- B#: Toward a Synthesis between Z and B.- Introducing Backward Refinement into B.- Expression Transformers in B-GSL.- Probabilistic Termination in B.- Probabilistic Invariants for Probabilistic Machines.- Proving Temporal Properties of Z Specifications Using Abstraction.- Compositional Verification for Object-Z.- Timed CSP and Object-Z.- Object Orientation without Extending Z.- Comparison of Formalisation Approaches of UML Class Constructs in Z and Object-Z.- Towards Practical Proofs of Class Correctness.- Automatically Generating Information from a Z Specification to Support the Classification Tree Method.- Refinement Preserves PLTL Properties.- Proving Event Ordering Properties for Information Systems.- ZML: XML Support for Standard Z.- Formal Derivation of Spanning Trees Algorithms.- Using B Refinement to Analyse Compensating Business Processes.- A Formal Specification in B of a Medical Decision Support System.- Extending B with Control Flow Breaks.- Towards Dynamic Population Management of Abstract Machines in the B Method.