The ICF classification is based on the psycho-social model of health and was developed by the WHO to better represent the health status of people with chronic illnesses and disabilities. It includes not only medical diagnoses but also functionality, participation, and environmental factors. When children with chronic illnesses or disabilities receive support measures based on the ICF-CY concept, the progress must also be assessed accordingly. This book introduces the ICF-CY for interdisciplinary planning and implementation regarding abnormal associated psychosocial circumstances, also supplemented by a precise summary. Thanks to the global collaboration of child and adolescent psychiatric institutions in this field, a complete, multidimensional representation of the disorders is available. New in the 7th edition: Own.