Gerald Patterson's social interactional model, which involves the mother's application and the child's counterapplication of "coercive" behaviors, also explains the development of aggressive conduct in the child. In this context, coercive behaviors include behaviors that are ordinarily punishing (e.g., whining, yelling, hitting, etc.). Abusive home environments can inhibit the growth of social cognitive skills needed, for example, to understand the intentions of others. Short-term longitudinal evidence is consistent with the view that a lack of social cognitive skills mediates the link between harsh parental discipline and aggressive conduct in kindergarten. Longer-term, follow-up research with the same children suggests that partial mediating effects last until third and fourth grade. Hirschi's (1969) control theory advances the view that children with weak affective ties to parents and school are at increased risk of engaging in delinquent and violent behavior in and out of school. Hirschi's cross-sectional data from northern California high-school students are largely consistent with this view. Findings from case-control and longitudinal studies are also consistent with this view.