Dr. Brennan's field is, of course, commonsense. His ""ten basic steps to a bright shining mind"" are explicitly applied to his theory that society judges its members on their ""illumination quotient"" -- the degree to which each (gently but unblushingly) reveals his intelligence and convinces others of its existence. He enjoins his audience to assess their true capacities, to make the most of such achievements as they already have, to avoid ""type-casting"" in work roles, to improve their vocabularies, speech, and vocal habits, to have ""more cultural"" fun. In perhaps his most telling passage, he urges: ""Find out what fuel of motivation, what rudder of argument, and what details will move another person to the point of view or action you want him to take"". Gigantic generalizations are a natural hazard of psycho-social handbooks; Dr. Brennan makes only a few of them and thus this is by and large one of the better volumes in this genre.