Depression is a serious medical illness that is difficult to diagnose and treat, especially in children and adolescents. Signs of depression in children may include the following behaviors: pretending to be sick; refusing to go to school; clinging to a parent; or worrying that a parent may die. Older children may sulk, behave inappropriately at school, act in a negative or grouchy manner, or feel misunderstood. Because normal behaviors vary from one childhood stage to another, it can be difficult to determine whether a child is going through a temporary "phase" or is suffering from depression. This study will compare IPT-AST, Enhanced IPT-AST, and Usual Care for the prevention of adolescent depression.