The software support of environmental protection, research and management is growing in importance and scope. Environmental informatics is a relatively young discipline, and its state-of-the-art research is developing very quickly. This book consists of overview articles, giving a broad insight into the area, and detailed research papers, which describe practical projects and state-of-the-art research. The book is divided into seven parts: environmental information systems; modelling and simulation; environmental management; decision support; distributed environmental information; artificial intelligence applications; and environmental data visualization. The material in the book is drawn from the proceedings of the International Symposium on Environmental Software Systems, organized by the International Federation for Information Processing and held at Penn State Great Valley, Malvern, USA in June 1995.