With the rise of the "information age" has come a prominence of information as a research concept. There is an increased appreciation of the intertwining nature of fields such as logic, linguistics and computer science that help to answer the questions about information and the ways it can be processed. This volume brings together ideas from diverse perspectives to present an emerging concensus about what a conclusive theory of information should be. The book provides an introduction to the topic, work on underlying ideas and the technical research that pins down the richer notions of information from a mathematical point of view. Topics covered include: a general theory of information; tackling of specific problems from artificial intelligence, formal semantics, cognitive psychology; the philosophy of mind; the dynamics of information flow; and a consideration of static approaches to information content. Throughout the book both quantitative and qualitative approaches are represented.