In response to the Sun's editorial "Not No. 1 in reform" (Dec. 22), why not make the National Board Certification for teachers the litmus for teacher tenure in Maryland? Teachers cannot sit for the National Board Certification until they have completed three full years of teaching in the same school district and must submit a portfolio, which should include video recordings, examples of student work and documentation of accomplishments outside the classroom that impact student learning. It sounds like there would need to be real proof in the pudding to earn that recognition.Harry Cooke, Bowie