Conclusions: The literature on methods and effects of information feedback by medical registries is heterogeneous, making it difficult to draw definite conclusions on its effectiveness. However, the positive effects cannot be discarded. Although our review confirms findings from previous studies that process of care measures are more positively influenced by feedback than outcome of care measures, further research should attempt to identify outcome of care measures that are sensitive to behaviour change as a result of feedback strategies. Furthermore, future studies evaluating the effectiveness of feedback should include a more extensive description of their intervention in order to increase the reproducibility of feedback initiatives and the generalizability of the results. (Source: Inter….