"Chestnut (1965) devotes one page of the more than 600 pages in his book to man as an operator or an element of man-machine systems. Hall (1962) devotes about a page and a half to human factors applications. Machol (1965) has a brief chapter of limited content on human factors, in which man is considered only as an information processor. Shearer et al. (1967) mention a driver and a steersman in their introductory chapter; thereafter, there is no of man, his characteristics, or his behavior. Wilson (1965) allocates three pages to human factors. For every book on systems engineering containing a mention of the human operator, there is another in which the words human, man, human factors, and psychology do not appear."