If extrasensory perception is a common human ability, why can't we all score high on ESP tests? Th is book answers the question by describing psychological determinants of success and failure in extrasensory perception. Some of the most signifi cant points raised in the editor's enlightening introduction are developed in greater detail in the nine essays that follow, all of them important statements giving a clear picture of research into ESP and the debate that surrounds it. Each essay is followed by a comment relating the essay to the fi eld as a whole.