Constitutes the thoroughly refereed postproceedings of the 18th International Workshop on Algebraic Development Techniques, WADT 2006, held in La Roche en Ardenne, Belgium, June 2006. This title addresses topics such as formal methods for system development, specification languages and methods, and distributed and mobile systems.

Contributed Papers.- A Temporal Graph Logic for Verification of Graph Transformation Systems.- On the Algebraization of Many-Sorted Logics.- Algebraic Semantics of Service Component Modules.- Autonomous Units and Their Semantics - The Parallel Case.- Reasoning Support for Casl with Automated Theorem Proving Systems.- Structured CSP – A Process Algebra as an Institution.- Incremental Resolution of Model Inconsistencies.- Coalgebraic Modal Logic in CoCasl.- SVtL: System Verification Through Logic Tool Support for Verifying Sliced Hierarchical Statecharts.- A (Co)Algebraic Analysis of Synchronization in CSP.