this volume contains selected papers from the symposium new results and newtrends in computer science held in graz, austria, june 20-21, 1991. the symposium was organized to give a wide-ranging overview of new work in the field on the occasion of the fiftieth birthday of the editor of the volume. topics covered include: information on neural nets, ideas on a new paradigm for informatics, hypermedia systems and applications, axioms for concurrent processes, techniques for image generation and compression, the role of data visualization, object-oriented programming andgraphics, algorithms for layout compaction, new methods in database systems, the future of data networks, object-oriented artificial intelligence, problems in data structures and sorting, aspects of user interfaces, a theory of structures, applications of cryptography, evaluation of ada, results in algorithmic geometry, remarks on the history of computers, and a novel interpretation of machine learning. in total, the 26 high-level contributions authored by prominent experts from all over the world give an up-to-date survey of almost all subfields of computer science. the book is written in a style which is easy to follow, and it is of interest for any computer scientist, be it in research, teaching or practice.