This volume contains selected papers from WADT 2004, the 17th International Workshop on Algebraic Development Techniques. Like its predecessors, WADT 2004 focussed on the algebraic approach to the speci?cation and development of systems, an area that was born around the algebraic speci?cation of abstract data types and encompasses today the formal design of software systems, new speci?cation frameworks and a wide range of application areas. WADT 2004 took place at the Technical University of Catalonia (UPC), Barcelona, Spain, on 27 29 March 2004, and was organized by Fernando Orejas and Jordi Cortadella. The program consisted of invited talks by Luis Caires (Universidade Nova de Lisboa, Portugal) and Reiko Heckel (University of Paderborn, Germany), and 33 presentations describing ongoing research on main topics of the workshop: formal methods for system development, speci?cation languages and methods, systems and techniques for reasoning about speci?cations, speci?cation devel- ment systems, methods and techniques for concurrent, distributed and mobile systems, and algebraic and co-algebraic foundations.

Inhalt
Invited Technical Paper.- Behavior-Preserving Refinement Relations Between Dynamic Software Architectures.- Contributed Papers.- Modelling Mobility with Petri Hypernets.- Cryptomorphisms at Work.- Towards a Formal Specification of an Electronic Payment System in CSP-CASL.- Algebraic Semantics of Design Abstractions for Context-Awareness.- CCC The Casl Consistency Checker.- Ontologies for the Semantic Web in Casl.- Theoroidal Maps as Algebraic Simulations.- Behavioural Semantics of Algebraic Specifications in Arbitrary Logical Systems.- A Simple Refinement Language for Casl.- A Distributed and Mobile Component System Based on the Ambient Calculus.- Application and Formal Specification of Sorted Term-Position Algebras.- From Conditional to Unconditional Rewriting.- Type Class Polymorphism in an Institutional Framework.- Architectural Specifications for Reactive Systems.