Among the many models of school reform that have emerged in the late 20th and early 21st centuries, one has endured for more than 50 years: the School Development Program (SDP). Established in 1968 by renowned child psychiatrist James P. Comer and the Yale Child Study Center, the SDP is grounded in the belief that successful schooling—particularly for children from disadvantaged backgrounds—must focus on the whole child. With that in mind, the SDP encompasses both academics and social-emot...