“…The methodological shortcomings of the family background studies are typical and serve to illustrate the point. Shortcomings have included small sample sizes (n= 15-105) (Husband & Hinton, 1972;Krall, 1953;Martin, 1970;Padilla et at., 1976;Plionis, 1977;Sibert, 1975); the absence of control or comparison groups (Husbaind & Hinton, 1972;Plionis, 1977); the use of subjective and non-standardised assessments of independent variables (Husbzind & Hinton, 1972;Martin, 1970;Padilla et al, 1976); and failure to have 'blind' interviews of families (Husband & Hinton, 1972;Martin, 1970;Sibert, 1975).…”