Five Core Propositions National Board for Professional Teaching Standards (NBPTS) What Teachers Should Know and Be Able to Do: The Five Core Propositions of the National Board NBPTS was created in 1987 after the Carnegie Forum on Education and the Economy’s Task Force on Teaching as a Profession released A Nation Prepared: Teachers for the 21st Century. Shortly after its release, NBPTS issued its first policy statement: What Teachers Should Know and Be Able to Do (PDF - 104kb).This policy set forth our vision for accomplished teaching. The Five Co in Assessment > Standardswith corenbptspropositionsstandards