““Whether a kid is sulking, pouting, whining, withdrawing, refusing to talk, crying, spitting, screaming, swearing, running out of the classroom, kicking, hitting, destroying property, or worse, you won’t know what to do about the challenging behavior until you understand why it’s occurring (lagging skills) and pinpoint the specific situations in which it occurs (unsolved problems). Lagging skills are the why of challenging behavior. Unsolved problems tell us when the behavior is occurring.””