The interdisciplinary early intervention for children with disabilities or at risk of disability aged 0 to 6 years has developed into a structured and professional field of work. This textbook describes and analyzes this field in terms of diagnostics, support and therapy, collaboration with parents, and institutional prerequisites. The authors provide interdisciplinary foundational knowledge and important scientific findings. They illustrate the individual steps of the early intervention process with numerous practical examples. For the 4th edition, the sections on diagnostics have been revised and supplemented to reflect the current state, and some other passages have been updated. The book is aimed at students of special and remedial education, social pedagogy, education, and psychology, as well as practitioners in early intervention and leaders in the field.