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Using the Behavior Problems Index ( BPI ) to assess behavioral difficulties , we found that 29 % of poor mothers who have a child with high levels of behavioral problems both lack paid leave and flexibility compared to 9 % of non-poor mothers . That is , it was principally designed not to examine scientifically or theoretically interesting questions but , rather , to generate behavioral information that investigators and others with protective responsibilities could use to conduct more effective assessments and prevent targeted attacks . Consequently , the team was not required to consider behavioral support strategies at this time . " According to the study , individuals who live in communities where residents retreat from public life had lower street efficacy than those where residents supported and monitored local youth , intervening to enforce behavioral norms . Lastly , to derive behavioral criteria for the evolution of collective behavior in social organisms .