This European Standard applies to the services offered by hearing aid professionals in their efforts to provide benefit for their clients. This European Standard specifies the process of hearing aid provision from the first client contact to the long term follow-up. This European Standard also defines requirements for education, facilities, equipment and code of conduct. A quality management system with the overall objective of securing client satisfaction and covering the elements of the service is also an essential part of the requirements. This European Standard centres on the services offered to the majority of clients with hearing impairment. Certain groups of hearing impaired such as children, persons with other disabilities or persons with implantable devices may require services beyond what is covered in this European Standard.