Two voices that I respect have expressed very similar ideas about the use of value-added measures (and, by extension, standardized test scores) in the teacher evaluation process.
Here is a brilliant slide from Bill Ferriter:
Larry Ferlazzo wrote this week about the same issue, using this line,
“Once you include test scores, no matter what percent you include, many teachers will tell you that it quickly becomes the “tail that wags the dog” — it always stays in the back (or front) of your mind.”
He goes on to share some links to alternative plans that show some serious merit.