More than 1,500 Florida teachers gained certification from the National Board for Professional Teaching Standards this year, in no small part because the state pays them up to $8,300 extra a year for the credential. But research is mixed over whether National Board teachers get better results from their students than other teachers, so it should come as no surprise that outcomes-oriented lawmakers might consider whether the investment - $59-million this year alone - is worth it. "We are examining teacher compensation in its entirety," said Rep. Joe Pickens, the Palatka Republican who chairs the House Schools and Learning Council. "It's not fair to say that the program is under attack, but we may be looking at it."