The "National Board for Professional Teaching Standards" ("NBPTS") establishes standards for accomplished teachers and awards professional certification to teachers who can demonstrate that their teaching practices meet those standards. Educators and experts in child development and related fields established the organization, and these experts work to develop and refine the standards for accomplished teaching based on the knowledge and skills that effective teachers demonstrate. The standards reflect five core propositions: (1) effective teachers are committed to students and their learning, (2) effective teachers know the subjects they teach and how to teach those subjects to students, (3) effective teachers manage and monitor student learning, (4) effective teachers think systematically about their practice and learn from experience, and (5) effective teachers are members of learning communities. Those seeking certification from the "NBPTS" must complete a computer-based assessment and three portfolio entries. The certification process can take 1 to 5 years. The What Works Clearinghouse (WWC) identified five studies of "NBPTS" certification that both fall within the scope of the Teacher Training, Evaluation, and Compensation topic area and meet WWC group design standards. No studies meet WWC group design standards without reservations, and five studies meet WWC group design standards with reservations. Together, these studies included more than 1,316,146 elementary and middle school students in grades 3 to 8 in four states. "NBPTS"-certified teachers had mixed effects on mathematics achievement and no discernible effects on English language arts achievement for students in grades 3 through 8.