Luciano Floridi presents a book that will set the agenda for the philosophy of information -- the study of the nature of information and the development of information-theoretic and computational methodologies for philosophy. It revitalizes old philosophical questions, poses new problems, and it has already produced a wealth of important results. Very well written, and clearly presented. ... many authors have written about philosophy and information before, but no-one has set out to deal with it in such a thorough way. This is clearly a very important book, and I think it justifies the author's claim that it describes the first philosophical analysis of information in all its aspects.