Persons with head and neck cancer (HNC) sometimes face drastic functional problems in breathing, eating, speech production and pain. Also disfigurement can lead to changes in self-image, worsened relationship with the partner and increased social isolation. Determining how to measure functioning in every-day life-situations or quality of life has been a challenging task. Previously available measures often posed issues of reliability, validity, conciseness and/or cross-cultural application. In addition, many tools concentrated on selected aspects of the entire problem. For clinical practice and research it having a practical framework that covers the entire spectrum of disabilities and guides all aspects of rehabilitation would be valuable. To tackle this issue, the World Health Organiz...