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.