The National Board for Professional Teaching Standards (NBPTS) assesses teaching practice based on videos and essays submitted by teachers. We compared the performance of classrooms of elementary students in Los Angeles randomly assigned to NBPTS applicants and to comparison teachers. We used information on whether each applicant achieved…

Compared the academic achievements of students taught by undercertified primary school teachers, including teachers from the "Teach for America" program, to those of students taught by regularly certified teachers. Findings for 5 school districts, roughly 300 new teachers, show that students of under-certified teachers make about 20%…