Error rate studies are key to establishing validity in many expert-opinion-based forensic disciplines.  The focus of this symposium is to provide a summary of the classical approaches to forensic evidence interpretation and discuss recent methods arising out of the machine learning and biometrics community concerning the use of error rates in the presentation of evidential strength.  Participants will work to develop a draft proposal for how the OSAC Statistics Task Group should advise various disciplinary groups on developing studies to estimate relevant error rates.