This book is a general introduction to Chomsky's thought in that the author devotes a large portion of it to the implications of Chomsky's work for psychology, philosophy, and politics, and to what Chomsky has said explicitly about these matters. One of the most striking features of Chomsky's thought is that he wants to break down the recently erected professional borderlines between psychology, philosophy, politics, and linguistics, that is, the divisions between our various sorts of knowledge of the world, man, and language and those between our knowledge of man and the participation in humanity.