This volume owes its existance to many different sources and influ ences. It is based on a meeting that took place from April 30 to May 2, 1982 at the University of Technology in Darmstadt. The idea for that meeting came while we were elaborating a research program on concept development and the development of word meaning; we were inspired by Werner Deutsch of the Max Planck Institute for Psycholinguistics in Nijmegen (The Netherlands) and by the Volkswagen Foundation in Hannover (Federal Republic of Germany) to organize an international conference on the same topic. We set out to invite a...