Science fiction has evolved and diverged in many ways and moods. When World Views Collide is the third and final volume in a history of the genre that began with Foundations of Science Fiction and continued in Great Themes of Science Fiction. The conflicts in science fiction are conflicts about world views, which Pierce defines as fundamental beliefs about the nature of man, the universe, and man's place in the universe. Pierce presents each world view in science fiction on its own terms, as expressed in the works of its partisans. This final volume of the trilogy thus examines science fiction as a way of defining and delimiting humanity and human values, which may well be the most important aspect of the genre today. This unique and formidable study is based on a reading of much of the genre from its beginnings to its most recent publication. Pierce traces relationships and erects a framework on which future scholars can build in their efforts to place the works and the fields in the totality of world literature. Fans of science fiction, those interested in the history and literary criticism of the genre, and anyone interested in popular culture and literature, and world literature will find When World Views Collide enlightening and thought-provoking reading.