This book is based on the proceedings of the "International Working Conference on Model Realism" which was held in Bad Honnef near Bonn, April 20 - 23, 1982. .Both its theme and format of discussion were unconventional. Their main motivation can be de scribed as follows: In the last several years there has been a growing interest in determining the ex tent to which different methodologies are able to adequately deal with real-world problems of contemporary interest, especially when people from different disciplines are involved in a large-scale project. The conference was to deal with the...