The document provides the diagnostic criteria for Posttraumatic Stress Disorder (PTSD) according to the DSM-IV-TR (2000) and DSM-5 (2013). The DSM-IV-TR criteria include 17 symptoms across four categories: re-experiencing, avoidance and numbing, increased arousal, and duration. The DSM-5 criteria consolidate some symptoms and include 20 symptoms across eight categories: exposure to trauma, intrusion, avoidance, negative alterations in cognitions and mood, alterations in arousal and reactivity, duration, functional significance, and exclusion criteria. The document asks how an updated PTSD measure would incorporate similarities and differences between the DSM-IV-TR and DSM