This report conveys the findings and recommendations of the Defense Science Board (DSB) Task Force (TF) on Predicting Violent Behavior. This study was chartered and co-sponsored by the Under Secretary of Defense for Acquisition, Technology, and Logistics (USD(AT&L)) and the Under Secretary of Defense for Policy (USD(P)). This DSB study is one of several reviews that resulted from the killings that took place on November 5, 2009 at the Fort Hood, Texas Soldier Readiness Center, and is submitted in response to the Terms of Reference (TOR) of May 21, 2011.