Peter Drucker is announced here as "the first among the leading management thinkers of our time, to have addressed himself to the executive role in the age of the computer." While he is cognizant of man and machine (man is perceptual, the machine logical and limited), most of his book adheres to orthodox concerns of the executive, who is expected "to get the right things done." "Intelligence, imagination, and knowledge are essential resources, but only effectiveness converts them into results," he says, and goes on to tick off five elements of such effectiveness: (1) know where your time goes;(2) focus on outward contribution; (3) build on strength; (4) concentrate on the few major areas where superior performance will produce outstanding results; (5) make effective decisions. He tells how to accomplish in these areas, what will be gained; how to deal with subordinates and superiors, prune "investments in managerial ego," etc. He considers his advice valid for executives of all kinds, corporate to collegiate; and closes with the assurance and admonition that all this can and must be learned. Effective execution.