This book constitutes the refereed proceedings of the 11th International Conference on Algebraic Methodology and Software Technology, AMAST 2006, held in Kuressaare, Estonia in July 2006, co-located with MPC 2006, the 8th International Conference on Mathematics of Program Construction.

The 24 revised full papers presented together with 3 system demonstrations and 3 invited talks were carefully reviewed and selected from 55 submissions. Among the topics covered are all current issues in formal methods related to algebraic approaches and to software engineering including abstract data types, process algebras, algebraic specification, model checking, abstraction, refinement, mu-calculus, state machines, rewriting, Kleene algebra, programming logic, and formal software development.