The NBPTS is grounded on five core propositions which include the following:
Based on the National Board’s core policy statement, What Teachers Should Know and Be Able to Do and the Five Core Propositions, standards have been created for each available certificate area. Based on these standards, teachers provide evidence of how they meet the high and rigorous standards in a two-step process that includes a school-site portfolio and exercises at the assessment center. The portfolio evidences a teacher’s practice through student work and knowledge, videotapes of classroom interaction, and written commentaries. The assessment center exercises focus on subject knowledge that are age and content-appropriate.