The American Educational Research Association is warning schools against using value-added scores when they make high-stakes decisions about teachers.
Value-added scores aim to measure the impact a teacher or teacher
preparation program has on student achievement. But from a research
perspective, it's very difficult to successfully isolate teachers and their
training programs from the myriad other factors that play into how students
perform on tests, AERA said in a new policy statement.
In fact, the conditions needed to make VAM scores accurate can't be met in
many cases, according to the statement.
"This statement draws on the leading testing, statistical, and
methodological expertise in the field of education research and related
sciences, and on the highest standards that guide education research and its
applications in policy and practice," said AERA Executive Director Felice