The assessment of child-rearing beliefs and behavior has predominantly focused on qualities and characteristics believed to reflect consistent, enduring qualities of parenting--the similarity in child rearing. This review evaluates the evidence for similarity and differences among 3 types of child-rearing data and includes comparisons across time, children, and situations. Both relative stability and mean level differences were found in all 3 domains. The most similarity was found in the across-time and across-children domains, although it depended on the child-rearing construct and methodology used. It is argued that attention to the variability and change in child rearing must be incorporated into theoretical models of parenting to better understand the nature of child rearing and, in turn, parental influence on children's development.