by Chris Matthew Sciabarra (Foreword by), Roger E. Bissell (Introduction by), Barbara Branden (Author)

As the author shows, thinking is not an automatic process known to everyone "instinctively," but an acquired skill; and - like every human skill - it involves certain principles which have to be identified and learned. She discusses these principles in detail and spells out the specific techniques for avoiding thinking errors and maximizing the productiveness of one's mental effort.