Alan Robinson This set of essays pays tribute to Bob Kowalski on his 60th birthday, an anniversary which gives his friends and colleagues an excuse to celebrate his career as an original thinker, a charismatic communicator, and a forceful intellectual leader.

Logic in Databases and Information Integration.- MuTACLP: A Language for Temporal Reasoning with Multiple Theories.- Description Logics for Information Integration.- Search and Optimization Problems in Datalog.- The Declarative Side of Magic.- Key Constraints and Monotonic Aggregates in Deductive Databases.- Automated Reasoning.- A Decidable CLDS for Some Propositional Resource Logics.- A Critique of Proof Planning.- A Model Generation Based Theorem Prover MGTP for First-Order Logic.- A ‘Theory’ Mechanism for a Proof-Verifier Based on First-Order Set Theory.- An Open Research Problem: Strong Completeness of R. Kowalski’s Connection Graph Proof Procedure.- Non-deductive Reasoning.- Meta-reasoning: A Survey.- Argumentation-Based Proof Procedures for Credulous and Sceptical Non-monotonic Reasoning.- Automated Abduction.- The Role of Logic in Computational Models of Legal Argument: A Critical Survey.- Logic for Action and Change.- Logic Programming Updating - A Guided Approach.- Representing Knowledge in A-Prolog.- Some Alternative Formulations of the Event Calculus.- Logic, Language, and Learning.- Issues in Learning Language in Logic.- On Implicit Meanings.- Data Mining as Constraint Logic Programming.- DCGs: Parsing as Deduction?.- Statistical Abduction with Tabulation.- Computational Logic and Philosophy.- Logicism and the Development of Computer Science.- Simply the Best: A Case for Abduction.