The thirteen chapters written expressly for this book by logicians, theoretical computer scientists, philosophers, and semanticists address, from the perspective of mathematical logic, the problems of understanding and studying the flow of information through any information-processing system. The logic of information flow has applications in both computer science and natural language processing and is a growing area within mathematical and philosophical logic. Consequently, Logic and Information Flow will be of interest to theoretical computer scientists wanting information on up-to-date formalisms of dynamic logic and their possible applications; logicians who wish to expand their discipline beyond the realm of sound reasoning in the narrow sense; and philosophers who are looking at the nature of information and action, and at the relation between those concepts.