The concept of personality disorders is generally completely unknown in social pedagogy practice and the educational sector. This is a significant shortcoming today. In the fields of school, school social work, and youth assistance, we increasingly encounter adolescents who exhibit psychological disturbances, problematic personality styles, or personality disorders. Those affected are extremely difficult to interact with, show little willingness to cooperate, and place high demands on professionals, as they regularly provoke challenging situations that lead to a high level of stress. Additionally, there is usually a lack of self-awareness regarding their problematic behavior. In this first of three volumes, "Understanding Personality Disorders in School, School Social Work, and Youth Assistance," the focus is primarily on adolescents who are often exploitative in everyday practice.