Dr. Stephen Mucher is an assistant professor of history and
education at Bard College. In
this public radio interview
, he explains the original
(and still valid!) purpose of teacher evaluation.

Professors visited classrooms not to grade teachers, but to learn about
instruction and how to improve it. It was a mutual endeavor,
intended to help, not to destroy and punish and fire. History has
much to teach us, if only we are willing to learn.

Here is my take, not Mucher’s:

The current era of teacher evaluation can be traced
to the social efficiency movement that began with the work of
Frederick Winslow Taylor. His time-and-motion studies emphasized
the importance of measuring the worker’s output and challenging all
workers to meet the same metric. In the 1920s, efficiency experts
took a leading role in the field of curriculum and instruction. Men
like John Franklin Bobbitt and W.W. Charters devised elaborate
checklists to measure teacher quality. Bobbitt came up with
cost-benefit analyses for subject matter, and he decided that Latin
should be discarded because it cost too much and produced nothing
of value, by his measures.

I wrote about the efficiency movement in
my 2000 book Left Back: A Century of Battles Over School
Reform.
The original title was Left Back: A
Century of Failed School Reforms.
I hated the title and
I hated the subtitle. The editor at Simon & Schuster, Alice
Mayhew–a legendary figure–insisted that the title had to have the
word “fail” in it. When the book came out in paperback, I was
allowed to change the subtitle to more accurately reflect the
content of the book (forgive the split infinitive).