“…Other cost studies of single programs, although less rigorous than the Perry Preschool and STAR evaluations, demonstrated that the programs assessed were worth the money invested in them. Stern, Dayton, Paik, and Weisberg (1989) found that special schools for at-risk students that combined academic and vocational courses were cost-effective, as were a Mexican technical education program for low-income students (Lopez-Acevedo, 2003), a Grade 5 mathematics program (Quinn, van Mondfrans, & Worthen, 1984), and a computerassisted instructional program (Fletcher, Hawley, & Piele, 1990).…”