First of a three-book series covering the world of remote tomorrows, the effectiveness of this first volume is curtailed by its attempt to cover more than a century in time with its many generations of characters. Psychohistorian Seldon senses the coming crash of the galactic empire, prepares a chosen corps of his best students to colonize a remote planet where war cannot impede his work. The story of this colony's survival and eventual command of the broken empire sustains the narrative which is- this time-better science than fiction.