Analyzing and Modeling Data and Knowledge : Proceedings of the 15th Annual Conference of the “Gesellschaft für Klassifikation e.V.“ University of Salzburg February 25–27 1991 The volume contains revised versions of papers presented at the 15th Annual Meeting of the Gesellschaft f}r Klassifika tion . Papers were arranged in the following three parts which were the main streams of discussion during the confe rence: 1. Data Analysis Classification 2. Data Modeling Knowledge Processing 3. Applications Special Subjects. New results on developing mathematical and statistical methods allowing quantitative analysis of data are reported on. Tools for representing modeling storing and processing da ta and knowledge are discussed. Applications in astro phycics archaelogy biology linguistics and medicine are presented