G.R.E.A.T. (Gang Resistance Education And Training) is six week, evidence-based and effective gang and violence prevention program built around school-based, law enforcement officer-instructed classroom curriculum. The program is intended as an immunization against delinquency, youth violence, and gang membership for children in the years immediately before the prime ages for introduction into gangs and delinquent behavior. It also walks the students through processes like decision making, conflict resolution, anger management, and the consequences of gangs and violence. It also builds their relationship and trust with law enforcement personnel.