Invited Talks -- Nonmonotonic Tools for Argumentation -- Relax, Compensate and Then Recover: A Theory of Anytime, Approximate Inference -- Counter Systems for Data Logics -- Regular Papers -- Similarity-Based Inconsistency-Tolerant Logics -- Decomposition of Distributed Nonmonotonic Multi-Context Systems -- Bridging Possibilistic Conditional Knowledge Bases and Partially Ordered Bases -- A Decidable Constructive Description Logic -- A Normal Form for Linear Temporal Equilibrium Logic -- Rational Closure for Defeasible Description Logics -- Extensional Higher-Order Logic Programming -- dl2asp: Implementing Default Logic via Answer Set Programming -- Sets of Boolean Connectives That Make Argumentation Easier -- Retroactive Subsumption-Based Tabled Evaluation of Logic Programs -- Preference-Based Inconsistency Assessment in Multi-Context Systems -- A Logical Semantics for Description Logic Programs -- An Incremental Answer Set Programming Based System for Finite ModelComputation -- Parametrized Logic Programming -- Counterexample Guided Abstraction Refinement Algorithm for Propositional Circumscription -- : A Context Description Logic -- Stable Belief Sets Revisited -- Efficient Inferencing for OWL EL -- Translating First-Order Causal Theories into Answer Set Programming -- Preprocessing Boolean Formulae for BDDs in a Probabilistic Context -- Minimal Knowledge and Belief via Minimal Topology -- A Logical Account of Lying -- Tabling with Answer Subsumption: Implementation, Applications and Performance -- Embracing Events in Causal Modelling: Interventions and Counterfactuals in CP-Logic -- An Approximative Inference Method for Solving ???SO Satisfiability Problems -- Horn Contraction via Epistemic Entrenchment -- System Descriptions -- The DMCS Solver for Distributed Nonmonotonic Multi-Context Systems -- The mcs-ie System for Explaining Inconsistency in Multi-Context Systems -- Coala: A Compiler from Action Languages to ASP -- DLV MC : Enhanced Model Checking in DLV -- A Dynamic-Programming Based ASP-Solver.