The five-volume textbook on speech therapy and logopedics is aimed at all professional groups that work in theory and practice with individuals who have speech, language, swallowing, and voice disorders, taking an interdisciplinary approach. It provides a systematic overview of the various areas of responsibility, with a concise presentation that reflects the current state of research. The first volume focuses on fundamental and overarching questions regarding the positioning and self-understanding of speech therapy and logopedics. The thematic spectrum ranges from interdisciplinary reference points—such as education, linguistics, medicine, psychology, and sociology—to the areas of speech therapy, organizational forms, and legal foundations, as well as future-oriented aspects of evaluation and quality assurance.