This book provides both law students and those from other fields of study with an introduction to the sometimes complex area of social law. The focus is on the systematics of this legal field. In addition to the substantive aspects, the formal social law is also appropriately addressed. The textbook presents the system and interactions of social law provisions in a concise manner. Key statements, definitions of important terms, comprehension questions, and diagrams complement the educational objectives of this book. The 4th edition has been thoroughly updated, taking into account, among other things, the planned citizen's income and the new SGB XIV.