This proceedings volume contains revised and reviewed papersbased on talks presented at the first International Workshopon Nonmonotonic and Inductive Logic held in Karlsruhe, December 1990. The workshop was supported by theVolkswagen-Stiftung, Hannover, and provided a forum forresearchers from the two fields to communicate and findareas of cooperation. The papersare organized into sectionson: - Nonmonotonicity in logic programs- Axiomatic approach to nonmonotonic reasoning- Inductive inference- Autoepistemic logic- Belief updatesThe bulk of the papers are devoted to nonmonotonic logic andprovide an up-to-date view of the current state of researchpresented by leading experts in the field. A novelty in thecontributions from the area of inductive logic is theanalysis of nonmonotonicity in the theory of inductivelearning.