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The aim of this second edition remains that of the first edition: to provide a clear and succinct synthesis of the information science discipline, in as holistic a way as possible; to give the reader a grasp of the basics and a platform to go into all aspects in more depth. It is intended as an overview, showing the scope and the landscape of the subject. We have tried to examine, in reasonably consistent if brief way, all the aspects of the subject and their interrelations, while not allowing details to obscure the whole picture. As with the first edition, the book is rooted in the scholarly and professional literature, with a substantial number of references. We hope that it may act as a useful sourcebook for the subject and a reminder that no textbook can be an alternative for engagement with the subject’s literature. The conceptual and historical dimensions have been retained, since we feel that it is vital that students and practitioners alike have an appreciation of these, to complement more practice-focused materials.