In recent years, significant progress has been made in the research of Prader-Willi Syndrome (PWS) and its treatment methods; the new findings have led to a considerable improvement in the quality of life for those affected by PWS. Urs Eiholzer has been caring for children with PWS and their families for many years and is also the author of numerous relevant scientific contributions. Eiholzer advocates for a comprehensive, integrative treatment approach that considers both the biological and psychological aspects of the syndrome. The book provides an overview of the typical clinical picture of Prader-Willi Syndrome, its genetic causes, recent research results, and the treatment methods applied in the author's practice, all presented in a way that is accessible even to laypersons. Rich visual material and graphics complement the content.