Family development theory focuses on the systematic and patterned changes experienced by families as they move through their life course. The term family as used here represents a social group containing at least one parent-child relationship. The family group is organized and governed by social norms. The general notion of a family life-cycle has a long history that dates back to 1777 (Mattessich and Hill 1987). A more conscious formulation known as family development theory began after World War II with work on family stress by Reuben Hill (1949) and a later textbook by Evelyn Duvall (1957). The first systematic statement of the approach characterized family development as proceeding through life-cycle stages (family stages) such as early marriage, families with young children, the launching of children out of the home, and the empty nest