Medical simulation training - an overview of the evidence Medical simulation training has become an important model for training of technical and non-technical clinical skills, aiming at preventing avoidable mistakes. The evidence for effects of simulation training is increasing, and several systematic reviews on the effect of medical simulation training have been published. This article summarizes the evidence for medical simulation training based on systematic reviews of medical simulation published in the last three years. There is a consistent finding in all systematic reviews that simulation training has a positive effect on learning and skills transfer, and small positive effects on patient-related outcomes. However, there is considerable uncertainty about the strength of evidence of this research, and all systematic reviews reported serious weaknesses in research methods of the included studies. We hope that the newly published guidelines for study design and reporting of medical simulation research can help create a stronger evidence base.