The orthognathic surgery team at the University of Oslo is one of two national orthognathic teams in Norway. In addition to performing surgery, the responsibilities are to assist in treatment planning and to co-ordinate treatment. All patients are monitored for 3 years after the operation. In addition to clinical and radiographic recordings, data are collected from patient questionnaires. This lecture presents research based on patients who have been operated during the last 20 years, summarizing findings related to outcome of various surgical procedures in terms of stability and patient satisfaction.