English summary: The educational psychology-based approach Applied Behavior Analysis (ABA), which is one of the most scientifically-based methods for addressing autism spectrum disorders, makes possible substantial advances in language, development and independence. As a practical example, this book highlights the introduction of the ABA in Northern Ireland through the PEAT Initiative (Parents Education as Autism Therapists) as well as information concerning the state of professional and social law in Germany. German description: Der lernpsychologische Ansatz ''Applied Behaviour Analysis'' (ABA) - als einziger wissenschaftlich belegt - ermoglicht bei autistischen Storungen grosse Fortschritte in Sprache, Entwicklung und Selbstandigkeit. Das Werk schildert praxisnah die Einfuhrung von ABA in Nordirland uber die Initiative PEAT (Parents? Education as Autism Therapists), zudem enthalt es Erlauterungen zur fachlichen und sozialrechtlichen Situation in Deutschland.