there is an economist at the hoover institution eric hanushek who has argued we have tried to help teachers but didn't produce two or performance of the best way to seat test scores go up is to fire the bottom 10% of teachers each year. what does that do for moralock? you don't know if it's going to be you. the hatchet is over everybody's head but the bottom line is there is no other country in a world that's doing this. if it's such a good idea wire the all -- we the only ones who thought of that? the chief of the matter is as linda darling hammond at stanford once said in a court case where she was testifying against eric hanushek, you cannot fire your way to finland. [laughter] another way to put it is you cannot fire your way to excellence. the truth is that the threat of firing, the insecurity that it introduces, the knowledge that teachers have that these measures are so unstable and so invalid and so unfair to moralize as teachers. we have had on the last few years report after report, one coming from the metlife survey and another that was funded by gates scholastic. massive demoral