Book excerpt: This classic Family Therapy text continues to provide “a new and more comprehensive way to think about human development and the life cycle,” reflecting changes in society away from orientation toward the nuclear family, toward a more diverse and inclusive definition of “family.” This expanded view of the family includes the impact of issues at multiple levels of the human system: the individual, family households, the extended family, the community, the cultural group, and the larger society. The text features a ground-breaking integration of individual male and female development in systemic context; our increasing racial, ethnic, and cultural diversity; the emergence of men's movements and issues; the growing visibility of lesbian and gay families; and the neglected area of social class.