The public survey that was conducted by the IDB for the Copenhagen Challenge process identified the problem of “crime and violence” as one of the areas of major concern in the LAC region. In particular, the following items were identified (in descending or perceived priority): (a) high incidence of crime, (b) drug trafficking, (c) proliferation of violent youth gangs, (d) pervasiveness of money laundering, and (e) frequency of domestic violence. In conducting the research for this chapter, we evaluated the nature of the evidence on the extent to which these perceived issues would rise to the level of being “significant,” as well as the evidence on “what works” and what the benefits and costs are from programs that have been shown to be effective.