“…The domain of this review then is those studies where individuals working together on a group product were contrasted with individuals working separately on individual products. This delineation excluded social facilitation articles that reported only individual measures, risky shift studies that reported individual measures before and/or after group interaction, studies of mock juries that used individual scores to predict group outcome (see Davis, 1980;Davis, Kerr, Stasser, Meek, & Holt, 1977;Penrod & Hastie, 1979), and many articles related to the analysis of task dimensions (see Davis, 1969a;Duncan, 1959;Guilford, 1956;Lamm & Trommsdorff, 1973;McGrath & Altaian, 1966;Steiner, 1972;Zajonc & Taylor, 1963r). Psychotherapy research was omitted for lack of a group goal when individual objectives were established for each member (see Hartman, 1979;Lorge et al, 1958, p. 340).…”