Honoring the computer science pioneer Joseph Goguen on his 65th Birthday, this title includes the refereed papers by researchers in areas spanned by Goguen's work. It features the papers addressing a variety of topics from meaning, meta-logic, specification and composition, behavior and formal languages, and models, deduction, and computation.

Meaning.- Sync or Swarm: Musical Improvisation and the Complex Dynamics of Group Creativity.- My Friend Joseph Goguen.- Metalogic, Qualia, and Identity on Neptune’s Great Moon: Meaning and Mathematics in the Works of Joseph A. Goguen and Samuel R. Delany.- Meta-Logic.- Quantum Institutions.- Jewels of Institution-Independent Model Theory.- Semantic Web Languages – Towards an Institutional Perspective.- Institutional 2-cells and Grothendieck Institutions.- Some Varieties of Equational Logic.- Complete Categorical Deduction for Satisfaction as Injectivity.- Specification and Composition.- Extension Morphisms for CommUnity.- Non-intrusive Formal Methods and Strategic Rewriting for a Chemical Application.- From OBJ to ML to Coq.- Weak Adhesive High-Level Replacement Categories and Systems: A Unifying Framework for Graph and Petri Net Transformations.- From OBJ to Maude and Beyond.- Constructive Action Semantics in OBJ.- Horizontal Composability Revisited.- Composition by Colimit and Formal Software Development.- Behaviour and Formal Languages.- Proving Behavioral Refinements of COL-specifications.- The Reactive Engine for Modular Transducers.- A Bialgebraic Review of Deterministic Automata, Regular Expressions and Languages.- Sheaves and Structures of Transition Systems.- Uniform Functors on Sets.- An Algebraic Approach to Regular Sets.- Models, Deduction, and Computation.- Elementary Algebraic Specifications of the Rational Complex Numbers.- From Chaos to Undefinedness.- Completion Is an Instance of Abstract Canonical System Inference.- Eliminating Dependent Pattern Matching.- Iterative Lexicographic Path Orders.- A Functorial Framework for Constraint Normal Logic Programming.- A Stochastic Theory of Black-Box Software Testing.- Some Tips on Writing Proof Scores in theOTS/CafeOBJ Method.- Drug Interaction Ontology (DIO) and the Resource-Sensitive Logical Inferences.