Otger Autrata and Bringfriede Scheu articulate a fundamental definition of social work theory and understanding. It is of central importance for professional practice in social work that employees can draw on theoretical knowledge. For this to be possible, social work theory must be understood. Understanding involves the adoption of societal knowledge from the subject's perspective. It is important to note that understanding social work theory is not only about acquiring knowledge but also represents a subjective developmental challenge. This Vademecum is intended to serve as a reliable companion for orientation.