“…1978;King et al, 1983;Langford, 1975;Murphy and Gilligan, 1980;Perry, 1970;Sinnott, 1983] or indirectly [Arlin, 1975, andHartley, 1980, on problem finding; Commons et al, 1982, on metasystematic operations;Powell. 1980, on category operations;and Furby, 1979, on rea soning about unequal distribution]. Some of these studies have found increasing inci dences of relativistic and/or dialectical thought with entrance into early adulthood, both longitudinally [King et al, 1983] and cross-sectionally [Basseches, 1980;Com mons et al, 1982;Furby, 1979;Olsen et al, 1982] or with entrance into middle-age [Bas seches, 1980], Others have found no such dif ferences [Hartley, 1980;Powell, 1980;Sin nott, 1983].…”