This book provides an overview of the theory and practice of science communication. It covers the whole area and illustrates it by looking at the experience of research workers in science communication and those whose task is to put science communication into practice. It deals with modes of informal communication such as science centres, television programs, and journalism and the research that informs practitioners about the effectiveness of their programs. It aims to meet the needs of those studying science communication as well as the increasing numbers of people who are employed in science centres and museums but have no formal training in this field. It is envisaged that the book will form a readily accessible source of expertise for communicators.