Chemistry and Partial Order -- Partial Ordering of Properties: The Young Diagram Lattice and Related Chemical Systems -- Hasse Diagrams and their Relation to Molecular Periodicity -- Directed Reaction Graphs as Posets -- Environmental Chemistry and Systems -- to partial order theory exemplified by the Evaluation of Sampling Sites -- Comparative Evaluation and Analysis of Water Sediment Data -- Prioritizing PBT Substances -- Quantitative Structure Activity Relationships -- Interpolation Schemes in QSAR -- New QSAR Modelling Approach Based on Ranking Models by Genetic Algorithms - Variable Subset Selection (GA-VSS) -- Decision support -- Aspects of Decision Support in Water Management: Data based evaluation compared with expectations -- A Comparison of Partial Order Technique with Three Methods of Multi-Criteria Analysis for Ranking of Chemical Substance -- Field, Monitoring and Information -- Developing decision support based on field data and partial order theory -- Evaluation of Biomonitoring Data -- Exploring Patterns of Habitat Diversity Across Landscapes Using Partial Ordering -- Information Systems and Databases -- Rules and Complexity -- Contexts, Concepts, Implications and Hypotheses -- Partial Orders and Complexity: The Young Diagram Lattice -- Historical remarks -- Hasse Diagrams and Software Development -- Introductory References -- Introductory References. Partial Order? - Never heard of it! This comment will be heard no more, when the broadness of this mathematical concept has been explained. Many internationally renowned authors assist the reader in understanding what partial order is and where, why and how this concept can be used. Since all the authors have teaching experience, partial order is explained step by step. Mathematical formalism is avoided as far as ever possible. The book begins with some basics, considers applications in different fields and ends with some historical notes. After reading this book, the comment should become: Partial order! - Where is the next book?