$44$ of $175$Studies on staff interventions addressing performance problems indicate thatfunction$-$based interventions are.more effective than non$-$function$-$based interventions.function$-$based assessments are not necessary when analyzing staff performance issues.non$-$functioned$-$based interventions are more effective than function$-$based interventions.non$-$function$-$based interventions are as effective as function$-$based interventions.