| 1989 | ADL: Exploring the Middle Ground Between STRIPS and the Situation Calculus. | Edwin P. D. Pednault |
| 1989 | Probabilistic Semantics for Nonmonotonic Reasoning: A Survey. | Judea Pearl |
| 1989 | Defaults and Probabilities; Extensions and Coherence. | Eric Neufeld |
| 1989 | A Knowledge Level Analysis of Belief Revision. | Bernhard Nebel |
| 1989 | Taxonomic Syntax for First Order Inference. | David A. McAllester, Robert Givan, Tanveer Fatima |
| 1989 | Relating Autoepistemic and Default Logics. | V. Wiktor Marek, Miroslaw Truszczynski |
| 1989 | Plausible World Assumption. | Eliezer L. Lozinskii |
| 1989 | Argument Systems: A Uniform Basis for Nonmonotonic Reasoning. | Fangzhen Lin, Yoav Shoham |
| 1989 | Between Circumscription and Autoepistemic Logic. | Vladimir Lifschitz |
| 1989 | Analogy as a Constrained Partial Correspondence Over Conceptual Graphs. | Debbie Leishman |
| 1989 | What Does a Conditional Knowledge Base Entail? | Daniel Lehmann |
| 1989 | Knowledge Representation in a Case-Based Reasoning System: Defaults and Exceptions. | Phyllis Koton, Melissa P. Chase |
| 1989 | Localizing Temporal Constraint Propagation. | Johannes A. G. M. Koomen |
| 1989 | Hard Problems for Simple Default Logics. | Henry A. Kautz, Bart Selman |
| 1989 | Parallel Solutions to Constraint Satisfaction Problems. | Simon Kasif |
| 1989 | A Framework for Dynamic Representation of Knowledge: A Minimum Principle in Organizing Knowledge Representation. | Yoshiteru Ishida |
| 1989 | Ontological Assumptions in Knowledge Representation. | Graeme Hirst |
| 1989 | Induction as Nonmonotonic Inference. | Nicolas Helft |
| 1989 | Default Reasoning, Minimality and Coherence. | Hector Geffner |
| 1989 | A General Framework for Sorted Deduction: Fundamental Results on Hybrid Reasoning. | Alan M. Frisch |
| 1989 | Tractable Decision-Analytic Control. | Oren Etzioni |
| 1989 | Critical Issues in Nonmonotonic Reasoning. | David W. Etherington, Kenneth D. Forbus, Matthew L. Ginsberg, David J. Israel, Vladimir Lifschitz |
| 1989 | Situated Control Rules. | Mark Drummond |
| 1989 | Impediments to Universal Preference-Based Default Theories. | Jon Doyle, Michael P. Wellman |
| 1989 | Temporal Constraint Networks. | Rina Dechter, Itay Meiri, Judea Pearl |