We report findings from a Web-based survey of the International Society for Traumatic Stress Studies' members (n = 227) regarding use of trauma exposure and posttraumatic assessment instruments. Across clinical and research settings, the most widely used tests included the Posttraumatic Stress Diagnostic Scale, Trauma Symptom Inventory, Life Events Checklist, Clinician-Administered Post-traumatic Stress Disorder (PTSD) Scale, PTSD Checklist, Impact of Event Scale-Revised, and Trauma Symptom Checklist for Children. Highest professional degree, time since degree award, and student status yielded no differences in extent of reported trauma assessment test use.