A pause before violence cut Chicago boys’ arrests by up to 50%

Two randomised trials found that Youth Guidance’s Becoming a Man programme sharply reduced violent-crime arrests among teenage boys while they were enrolled, apparently by slowing impulsive reactions rather than building grit or offering conventional mentoring.

A Chicago school programme built around cognitive behavioural therapy has drawn renewed attention after researchers reported that it sharply reduced violent-crime arrests among teenage boys in two randomised trials. The intervention, called Becoming a Man and run by the nonprofit Youth Guidance, was tested in some of the city’s most violence-affected neighbourhoods and consistently produced large short-term drops in arrests while students were enrolled. The findings, published in the Quarterly Journal of Economics and reported in more recent summaries of the work, suggest that the programme’s impact came less from broad lessons about discipline or encouragement and more from teaching boys to interrupt automatic reactions before they escalated.

The first trial, carried out in Chicago schools during the 2008-09 academic year, involved 2,740 boys in grades seven through ten across 18 public schools. According to the research, those offered the programme were arrested for violent offences 45% less often during the school year than boys who were not invited. A second trial, run from 2013 to 2015 with 2,064 ninth- and tenth-grade students, found a similar pattern: violent-crime arrests fell 50% during the programme period, while total arrests declined by 35%. Researchers said the close match between the two trials matters because youth programmes often appear promising once but are never reproduced at scale.

The sessions themselves were simple. Boys met in small groups of about eight for an hour a week during school, led by college-educated men who were often from similar neighbourhoods. One exercise described by the researchers used a ball clenched in a fist to show how quickly teenagers can move from negotiation to confrontation. The point, they argue, was not to teach passivity but to create a pause between provocation and response. In their analysis, the authors said they found no strong evidence that the gains were explained by grit, emotional intelligence, social skills, or a general mentoring effect, although they acknowledged that the measures available to them were limited.

The researchers also tried to test the theory that the programme changed how boys made snap decisions. In one experiment, nearly 500 participants from the second trial were asked in a staged money game how much they would take from another student after hearing that the other player had taken some of their money. Boys who had not taken part in Becoming a Man responded in about 1.1 seconds, while those who had attended the programme took roughly 80% longer before deciding. The programme did not appear to make them more generous, but it did seem to slow down their reactions, which the researchers presented as suggestive evidence that the intervention altered how they processed conflict.

The benefits were not uniform over time. The Chicago Crime Lab, which helped carry out the research, has said the drop in arrests was measured while the programme was active and did not continue beyond that period in the first trial. Even so, that study found lasting educational effects, with participants 6 to 9 percentage points more likely to graduate. The broader evidence base is mixed in some later trials, according to technical materials from the Crime Lab, but the original results have remained influential because they point to a relatively low-cost approach to youth violence prevention. A separate study in Monrovia, Liberia, has added another wrinkle: researchers there found that cognitive behavioural therapy for men involved in crime and violence produced short-term improvements that faded, then reappeared years later in self-reported behaviour. Taken together, the studies have encouraged researchers to think less about toughness or mentorship as a cure-all and more about the power of teaching young people to pause before acting.