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Invited Papers.- Constraints and Probabilistic Networks: A Look At The Interface.- Toward A Universal Inference Engine.- Towards Systematic Benchmarking in Answer Set Programming: The Dagstuhl Initiative.- Regular Papers.- Semantics for Dynamic Logic Programming: A Principle-Based Approach.- Probabilistic Reasoning With Answer Sets.- Answer Sets: From Constraint Programming Towards Qualitative Optimization.- A Logic of Non-monotone Inductive Definitions and Its Modularity Properties.- Reasoning About Actions and Change in Answer Set Programming.- Almost Definite Causal Theories.- Simplifying Logic Programs Under Uniform and Strong Equivalence.- Towards Automated Integration of Guess and Check Programs in Answer Set Programming.- Towards Automated Integration of Guess and Check Programs in Answer Set Programming.- Graphs and Colorings for Answer Set Programming: Abridged Report.- Nondefinite vs. Definite Causal Theories.- Logic Programs With Monotone Cardinality Atoms.- Set Constraints in Logic Programming.- Verifying the Equivalence of Logic Programs in the Disjunctive Case.- Uniform Equivalence for Equilibrium Logic and Logic Programs.- Partial Stable Models for Logic Programs with Aggregates.- Improving the Model Generation/Checking Interplay to Enhance the Evaluation of Disjunctive Programs.- Using Criticalities as a Heuristic for Answer Set Programming.- Planning with Preferences Using Logic Programming.- Planning with Sensing Actions and Incomplete Information Using Logic Programming.- Deduction in Ontologies via ASP.- Strong Equivalence for Causal Theories.- Answer Set Programming with Clause Learning.- Properties of Iterated Multiple Belief Revision.- System Descriptions.- System Description: DLV with Aggregates.- GNT - A Solver for Disjunctive Logic Programs.- LPEQ and DLPEQ - Translators for Automated Equivalence Testing of Logic Programs.- DLV DB : Bridging the Gap between ASP Systems and DBMSs.- Cmodels-2: SAT-based Answer Set Solver Enhanced to Non-tight Programs.- WSAT(CC) - A Fast Local-Search ASP Solver.- Smodels with CLP-A Treatment of Aggregates in ASP.- nlp: A Compiler for Nested Logic Programming.