... 189–221.1 8EDUCAT I O N , HEALTH, AND D E VELOPME N TDavid E. BloomPROJECT ON UNIVERSALBASIC AND SECONDARY EDUCATION Education, Health, and Development EDUCAT I O N , HEALTH, AND D E VELOPME N T1 ... UNIVERSALBASIC AND SECONDARY EDUCATIONEDUCAT I O N , HEALTH, AND DE V E L O P M E NT1 Education, Health, and Development *D AV I D E . B L O O MThe separate roles of education and health in ... reasonably spread across treatment and control groups, and only randomization can ensure such comparability.In randomized tests, randomly selected treatment and control groups arelikely to be...