The present study is the next important step for this line of research. First, the present study is a far more developed examination of the potential effects of BCT on multiple dimensions of youth functioning, taken from multiple perspectives. Second, we do not know "how" BCT works. The positive effects of BCT on parents (reduced addition severity, improved dyadic adjustment, reduced partner violence, improved parenting, and improved parental psychological adjustment) may have positive "trickle down" effects on youth; however, we have not undertaken an empirical examination of these potential mechanisms of action. If we can understand how it works, we will be able to use that information to refine BCT to enhance the mechanisms that benefit youth. Thus, the present study will examine possible curative mechanisms. Third, we have a very limited understanding for "whom" it works. Thus, we will examine whether BCT may operate differently for children of different stages of development. If we can understand this moderating effect, we may be able to develop and refine BCT to meet the needs of families with children of different ages.