This paper evaluates the impact of a randomized training program for disadvantaged youth introduced in Colombia in 2005. This randomized trial offers a unique opportunity to examine the impact of training in developing countries. We use originally collected data on individuals randomly offered and not offered training. The program raises earnings and employment, especially for women. Women offered training earn 18% more and have a 0.05 higher probability of employment than those not offered training, mainly in formal sector jobs. Cost-benefit analysis of these results suggests that the program generates much larger net gains than those found in developed countries.