It's hard to imagine anything more devastating than a deadly shooting at a school. The setting (often thought of as among the safest places in our communities) and the ages of both victims and perpetrators are particularly troubling. The intense media coverage that typically follows a school shooting reinforces how disturbing such events are. As anyone who's been even tangentially involved with the follow-up of a school shooting knows, reactions to this kind of tragedy aren't uniform and involve as many questions as answers. The aftermath of a school shooting is exceptionally difficult to process--for survivors, of course, and also for classmates, friends and family of victims and survivors, educators, and policymakers. People struggle to find answers to fundamental but complex questions. Why did this happen? Did anyone see it coming? What is it about the perpetrator that we all missed, or failed to respond to properly? In essence, people want to know, could we have predicted--and thus prevented--this shooting from happening?