The Compendium of Academic Speech Therapy and Logopedics conveys the fundamentals of the content outlined in examination and study regulations. At the same time, it takes into account all areas of practice. The fourth volume, Aphasias, Dysarthrias, Speech Apraxia, Dysphagias - Dysphonias, addresses neurogenic speech and language disorders. Aphasias, dysarthrias, and dysphagias are becoming increasingly significant areas of focus, not only due to demographic changes. The recognition of their communicative life significance also leads to a changed approach in diagnosis and therapy.