This paper evaluates how the Progresa Program, which provides poor mothers in rural Mexico with education grants, has affected enrollment. Poor children who reside in communities randomly selected to participate in the initial phase of the Progresa are compared to those who reside in other (control) communities. Pre-program comparisons check the randomized design, and double- difference estimators of the program's effect on the treated are calculated by grade and sex. Probit models are also estimated for the probability a child is enrolled, controlling for additional characteristics of the child, their parents, local schools, and community, and for sample attrition, to evaluate the sensitivity of the program estimates. These estimates of pr...