1 Human Behavior and the Social Work Profession 2 Lenses for Conceptualizing Problems and Interventions: The Person in the Environment 3 Lenses for Conceptualizing Problems and Interventions: Biopsychosocial Dimensions 4 Lenses for Conceptualizing Problems and Interventions: Sociocultural Dimensions 5 Lenses for Conceptualizing Problems and Interventions: Social Change Dimensions 6 Pre-Pregnancy and Prenatal Issues 7 Development in Infancy and Early Childhood 8 Development in Middle Childhood 9 Development in Adolescence 10 Development in Early Adulthood 11 Development in Middle Adulthood 12. Development in Late Adulthood 13. Looking Forward: Challenges and Opportunities for the Social Work Profession