Findings from 2 longitudinal studies replicate and considerably extend past work on child temperament as a moderating link between parenting and successful socialization outcomes. In Study 1 (N = 106 mothers and children), child fearfulness, mother-child positive relationship, and maternal power assertion were assessed at 22 and 33 months; the outcome--children's moral self--was assessed at 56 months. In Study 2 (N = 102 mothers, fathers, and children), child fearfulness and parent-child positive relationship were assessed at 7 and 15 months; parents' power assertion was assessed at 15 months. The outcomes were children's receptive, willing stance toward the parent at 25 months, and rule-compatible conduct without supervision at 38 months. Child fearfulness significantly moderated the impact of parenting: In both studies, for relatively fearless children, mother-child positive relationship predicted future successful socialization outcomes in mother-child dyads. There was no analogous moderation effect in father-child dyads in Study 2. For relatively fearful children, fathers' power assertion in Study 2 predicted poor socialization outcomes. All Temperament x Parenting interactions appeared limited to measures obtained in the 2nd year.