“…Some researchers (Carey, 1974;Mikawa & Boston, 1968;Norvell & Guy, 1977;Plomin & DeFries, 1985;Singer, Brodzinsky, Ramsey, et al, 1985;Stein & Hoopes, 1985;Thompson & Plomin, 1988) argue that there are no appreciable differences in adjustment levels between adopted and nonadopted persons, whereas others (Bohmann & Von Knorring, 1979;Dalby, Fox, & Haslam, 1982;Dickson, Heffron, & Parker, 1990;Holden, 1991;Lipman, Offord, Boyle, & Ra-cine, 1993;Rogeness, Hoppe, Macedo, et al, 1988;Schechter, Carlson, Simmons, & Work, 1964;Sharma, McGue, & Benson, 1996a, 1996bSilver, 1970Silver, , 1989Simon & Senturia, 1966;Verhulst, Althaus, & Bieman, 1990a, 1990bVerhulst & Bieman, 1995) find significantly higher rates of maladjustment among adopted as compared to nonadopted persons. A few studies also show that on certain variables, adopted persons demonstrate higher functioning than do nonadopted persons (Marquis & Detweiler, 1985;Sharma et al, 1996a).…”