A Columbia B-School study of teachers in New York City found “no major differences in performance among students
taught by traditionally certified, alternatively certified or uncertified teachers.”

?Rather than worry about whether
a particular teacher has certification or which program they come from, just
be worried about whether they?re highly effective or not,? he [Professor Jonah Rockoff] says.
?That?s what really going to make a big difference in student achievement
for a district or a school.?