 Given the amount of resources spent on youth summer jobs programs over the past half century, the lack of evidence on such programs effects is startling. Because of the way Chicagos jobs program for disadvantaged youth - One Summer PLUS - is structured, the program will produce some of the only rigorous evidence to date on the effects of summer jobs programs. It will also measure the incremental effectiveness of adding a social-cognitive skill development component. Similar social-cognitive programming has been shown to reduce violent crime and increase school engagement in a recent randomized control trial. The evaluation will also assess the cost effectiveness of both treatment arms. 