The WHO International Classification of Functioning, Disability and Health (ICF) provides a coherent view of health from a biological, individual and social perspective. This view may be defined both as multi- and interdisciplinary management of one's functioning and health. This new classification is currently being assessed in multiple centres in 32 countries, on 12 health conditions. The Institute of Hygiene and Medical Ecology, School of Medicine, University of Belgrade, is one of them, serving as the centre where the classification is being tested in obese population. The objective of this paper is to provide information needed for further development and practical application of this classification in various health conditions. The new language of ICF is an exciting landmark event for preventive medicine and rehabilitation. It may lead to a stronger position of rehabilitation within the medical community, change multiprofessional communication and improve communication between patients and health professionals.