General introduction - purpose, underlying ideas and scope of the book, Iven Van Mechelen and Ryszard S. Michalski. Part 1 Theoretical views: psychological models of concepts - introduction, James Hampton and Daniele Dubois; concept, class and category in the tradition of Aristotle, J. Phil Sutcliffe; prototype models of concept representation, James Hampton; components of conceptual representation - from feature lists to recursive frames, Lawrence W. Barsalou and Christopher R. Hale; beyond prototypes and frames - the two-tiered concept representation, Ryszard S. Michalski; theories and concept formation, Gregory L. Murphy. Part 2 Inductive data-analysis: categories and concepts - introduction to data analysis, Hubert Fegber and Paul De Boeck; cluster analysis using proximities, Fionn d Murtagh; regression and discriminant analysis for analyzing judgements, Michael T. Brannick; the hierarchical classes approach - a review, Paul De Boeck, et al; Galois approach to the induction of concepts, Alain Guenoche and Iven Van Mechelen; using latent class analysis in categorization research, Geert De Soete; categories and concepts - theoretical views and inductive data analysis, Iven Van Mechelen, et al.