All participating units are entitled to receive a bench-marking report from the registry. The report generator is started by the participating unit, when data entry has been completed. As a first step each unit receives a data feedback sheet that is based on an electronic data plausibility and missing data analysis. After stating that all data are correctly entered the final report can be generated. This final report offers complete descriptive statistics of the unit data compared to the reference data from the previous 4 years of the corresponding specialty. Only data from units fulfilling a high data quality standard are used for the reference. More than 60% of the patients present in the unit need to participate and 80% of these patients need to have their outcome recorded. Optionally the period used for comparison can be extended until 2006. All descriptive statistics represent prevalent data and are not corrected for cross-sectional sampling to allow direct data control and interpretation.