Conducting comprehensive and thorough user acceptance testing (UAT) on an electronic data capture- (EDC-) based study prior to enrolling subjects is a critical, but oft-neglected task. It’s been found that welltested studies experience fewer deviations, r equire shorter submission timelines, facilitate end-point assessments and are easier for site personnel to use.  This article by Karen Dwyer, Dr. Karina Loyo and Corina Bereanu of Prelude Dynamics provides several strategies for focusing these efforts and conducting an effective UAT.