This volume contains the revised refereed papers accepted for the presentation at the Third International Conference on Logic Programming and Nonmonotonic Reasoning. The 28 papers presented define the state of the art in this interdisciplinary area of research.

Complexity results for abductive logic programming.- A terminological interpretation of (abductive) logic programming.- Abduction over 3-valued extended logic programs.- On logical constraints in logic programming.- An operator for composing deductive data bases with theories of constraints.- Update rules in datalog programs.- Characterizations of the stable semantics by partial evaluation.- Game characterizations of logic program properties.- Computing the well-founded semantics faster.- Loop checking and the well-founded semantics.- Annotated revision specification programs.- Update by means of inference rules.- A sphere world semantics for default reasoning.- Revision by communication.- Hypothetical updates, priority and inconsistency in a logic programming language.- Situation calculus specifications for event calculus logic programs.- On the extension of logic programming with negation through uniform proofs.- Default consequence relations as a logical framework for logic programs.- Skeptical rational extensions.- Reasoning with stratified default theories.- Incremental methods for optimizing partial instantiation.- A transformation of propositional Prolog programs into classical logic.- Nonmonotonic inheritance, argumentation and logic programming.- An abductive framework for extended logic programming.- Embedding circumscriptive theories in general disjunctive programs.- Stable classes and operator pairs for disjunctive programs.- Nonmonotonicity and answer set inference.- Trans-epistemic semantics for logic programs.- Computing the acceptability semantics.

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