The wide ranged subject "Conceptual and Numerical Analysis of Data" is obliged to indicate the variety of the concept of data and information as well as the manifold methods of analysing and structuring. This volume is subdivided into four sections: 1) Data Analysis and Classification: Basic Concepts and Methods 2) Applications in Library Sciences, Documentation and Information Sciences 3) Applications in Economics and Social Sciences 4) Applications in Natural Sciences and Computer Sciences. Section 1 contains 18 papers concerning concept analysis, cluster analysis, data analysis and multivariate statistics. The broad spectrum of 7 papers appointed to section 2 extends from applications of data analysis and concepts in information sciences to applications in terminology and humanities. The importance of data analysis for many questions of economics and social sciences becomes evident in section 3. This section consists of 10 papers dealing with problems of marketing research, decision making, computer-based decision support as well as problems of socioeconomics and macroeconomics. Finally, section 4 is composed to 4 papers on sequence analysis and phylogenetic trees and 3 papers on computer science.