An updated No Child Left Behind law should track the progress of teachers as well as students, a special commission said Tuesday.

The private commission said schools should be required to measure how well teachers are doing at raising student test scores – one of 75 recommendations in a report meant to guide Congress as it prepares to rewrite the 5-year-old law this year. The idea came under immediate attack from the nation’s largest teachers union.

Teachers should be evaluated annually based on progress in the test scores of their students, the panel said. Reviews by colleagues or school principals also would be part of the equation for determining teacher quality.

The current law requires testing in reading and math in grades three through eight and once in high school.