Object-orientation and the need for multi-paradigmatic systems constitute a challenge for researchers, practitioners and instructors. Presentations at the OCG/NJSZT joint conference in Klagenfurt, Austria, in September 1992 addressed these issues. The proceedings comprise such topics as: project management, artificial intelligence - modelling aspects, artificial intelligence - tool building aspects, language features, object-orientied software development, the challenge of coping with complexity, methodology, and experience, software engineering education, science policy, etc.