Examined relationship qualities and perceived social self- efficacy of 12-year-olds. Found that perceived low parental intimate support, high conflict with parents, and lower perceived self-efficacy were related to depression symptoms. Girls reported greater best friend intimate support and less conflict, greater self-efficacy, and stronger conflict-depression associations than boys. For boys, conflict management self-efficacy contributed unique variance to depression after intimate support and conflict were controlled. (Author/KB)