Fuzzy Sets Theory and Applications W. Vogel & M. Büttner GmbH Alberda from The Netherlands and formatIsbn:Softcover 9783642430046 Alberda from The Netherlands and conducted by various scientists from both countries This volume contains a collection of review articles that are extended versions of invited lectures given at the First Pamporovo Winter Workshop on Cooperative Phe nomena in Condensed Matter held in villa "Orlitza" (7th 15th March 1998 During the last two decades one has become more and more aware of the fact that not all this uncertainty is of stochastic (random) cha racter and that bad or no longer possible and when we really have to make use of the richness of human reasoning in its variety