Specification Before Satisfaction: The Case for Research into Obtaining the Right Specification —Extended Abstract— -- Visualising Larger State Spaces in Pro B -- Non-atomic Refinement in Z and CSP -- Process Refinement in B -- CZT: A Framework for Z Tools -- Model Checking Z Specifications Using SAL -- Proving Properties of Stateflow Models Using ISO Standard Z and CADiZ -- A Stepwise Development of the Peterson’s Mutual Exclusion Algorithm Using B Abstract Systems -- An Extension of Event B for Developing Grid Systems -- The Challenge of Probabilistic Event B—Extended Abstract— -- Requirements as Conjectures: Intuitive DVD Menu Navigation -- A Prospective-Value Semantics for the GSL -- Retrenchment and the B-Toolkit -- Refinement and Reachability in Event_B -- A Rigorous Foundation for Pattern-Based Design Models -- An Object-Oriented Structuring for Z Based on Views -- Component Reuse in B Using ACL2 -- GeneSyst: A Tool to Reason About Behavioral Aspects of B Event Specifications. Application to Security Properties -- Formal Verification of a Type Flaw Attack on a Security Protocol Using Object-Z -- Using B as a High Level Programming Language in an Industrial Project: Roissy VAL -- Development via Refinement in Probabilistic B — Foundation and Case Study -- Formal Program Development with Approximations -- Practical Data Refinement for the Z Schema Calculus -- Slicing Object-Z Specifications for Verification -- Checking JML Specifications with B Machines -- Including Design Guidelines in the Formal Specification of Interfaces in Z -- Some Guidelines for Formal Development of Web-Based Applications in B-Method.

This book constitutes the refereed proceedings of the 4th International Conference of Z and B users, ZB 2005, held in Guildford, UK in April 2005. The 25 revised full papers presented together with extended abstracts of 2 invited papers were carefully reviewed and selected for inclusion in the book. The papers document the recent advances for the Z formal specification notation and for the B method, ranging from foundational, theoretical, and methodological issues to advanced applications, tools, and case studies.