Audrey Amrein Beardsley invited Stanford Professor Emeritus Edward Haertel to explain why a video called “The Oak Tree Analogy” is flawed.

Apparently there are districts that use this video to try to explain teacher evaluations based on growth or decline of test scores.

Whether you are talking about oak trees or corn or teachers, VAM is Junk Science.

And if you want to know more, read Haertel’s excellent review of the research on VAM here.