Strength of anger management?

-Supporting reearch for its effectivness -Jane Ireland (2004) conducted a study with two group of offenders: one who took part in an anger management programme and another in a non-treatment crontrol -They were assessed using interviews, a behavioural checklist and a self-report questionnaire. They found 92% had improved in the experimental group on at least one measure, compared to no such improvements to the control group -Therefore, this shows that it is an effective treatment in reducing anger, increasing the internal validity of the progamme