Extended Abstracts of Invited Lectures -- Microprocessor Verification Using Efficient Decision Procedures for a Logic of Equality with Uninterpreted Functions -- Comparison -- Design and Results of the Tableaux-99 Non-classical (Modal) Systems Comparison -- DLP and FaCT -- Applying an ABox Consistency Tester to Modal Logic SAT Problems -- KtSeqC : System Description -- Abstracts of Tutorials -- Automated Reasoning and the Verification of Security Protocols -- Proof Confluent Tableau Calculi -- Contributed Research Papers -- Analytic Calculi for Projective Logics -- Merge Path Improvements for Minimal Model Hyper Tableaux -- CLDS for Propositional Intuitionistic Logic -- Intuitionisitic Tableau Extracted -- A Tableau-Based Decision Procedure for a Fragment of Set Theory Involving a Restricted Form of Quantification -- Bounded Contraction in Systems with Linearity -- The Non-associative Lambek Calculus with Product in Polynomial Time -- Sequent Calculi for Nominal Tense Logics: A Step Towards Mechanization? -- Cut-Free Display Calculi for Nominal Tense Logics -- Hilbert’s ?-Terms in Automated Theorem Proving -- Partial Functions in an Impredicative Simple Theory of Types -- A Simple Sequent System for First-Order Logic with Free Constructors -- linTAP : A Tableau Prover for Linear Logic -- A Tableau Calculus for a Temporal Logic with Temporal Connectives -- A Tableau Calculus for Pronoun Resolution -- Generating Minimal Herbrand Models Step by Step -- Tableau Calculi for Hybrid Logics -- Full First-Order Free Variable Sequents and Tableaux in Implicit Induction -- Contributed System Descriptions -- An Interactive Theorem Proving Assistant -- A Time Efficient KE Based Theorem Prover -- Strategy Parallel Use of Model Elimination with Lemmata.