In general the study showed a good agreement between the results from the audit team and the local team. The examination of the reference dosimetry showed an excellent agreement between the absorbed dose determined by the audit team and the local team. The spread of the results among the Swedish radiotherapy departments was much lower as compared to similar studies conducted in other countries. SSM believes that this is mainly due to the fact that the latest international dosimetry protocols are followed at each department. SSM (former the Swedish Radiation Protection Institute, SSI) promoted the implementation of the latest IAEA dosimetry protocol by arranging a course in 2002. The study also found errors in the CT transfer to density at two departments and at one department misalignment of the laser-positioning system was found.