When Carol Ewen, a school psychologist in Missoula, Montana, walks into the elementary classroom of a teacher she’s trained in the PAX Good Behavior Game (PAX GBG), she might find students crawling around on the floor like babies or acknowledging a “Spleem.” What they’re learning here is self-regulation skills, cooperation with peers, the ability to follow instructions and much more — and in a nonpunitive, trauma-informed way.