Type A Behavior and Your Heart (1974) updated and expanded--in exacting detail. Friedman recaps the basis of his original theory that a particular sort of behavior might be involved in the development of coronary heart disease, and defines it at some length: ""Type A behavior is above all a continuous struggle, an unremitting attempt to accomplish or achieve more and more things. . . in less and less time, frequently in the face of opposition--real or imagined--from other persons. The Type A personality is dominated by covert insecurity of status or hyperaggressiveness, or both."" Friedman and Ulmer then present other findings that have supported the theory (some of the newer physiological studies on norepinephrine and endorphins and heart disease tie in neatly here), and then describe their own study of group therapy as a treatment for Type A personalities. The self-treatment measures they suggest, drawing on their early results, concentrate on alleviating impatience, free-floating hostility, and self-destructiveness through awareness and meditation-type exercises. Supportive lifestyle changes--no smoking, good diet, exercise--are also emphasized. No quick fixes here: some of the text may be heavy going, and the prescribed self-help is hard work. A responsible presentation of new possibilities, perhaps all the more.