Three proposition that are central to J.R. Harris's groip socialozation theory (1995, 1998) are considered in ths review. These proportions are as follows: (a) Parental behaviors have no long-term efects on children's psychological charaacteristics, (b) peer groups are the primary environmental influence on psychological functioning, and (c) dyadic relationships are situation-spesific and do not generalize. The evidence that J.R. Harris has outlined in support of each of these proporsitions is reviewed as is additional empirical research not considered by J.R. Harris. Serious limitations to each proportion are identified. The available evidence is more consistent with a model of multiple socializations agent. An expanded research agenda that permits a more definitive test of J.R. Harris's proportions and social relationships theory is proposed.