The Washington Post – Jay Mathews
“Our mistake was thinking this valuable long-term research tool would work as a one-year teacher rating system. “It becomes like a sick game of telephone: What starts out as a reasonable idea, when whispered down the line to people who don’t really get the details — or don’t want to get them — becomes an abomination,” he wrote. ‘By looking at individual teachers, over only one year (instead of the minimum three years as the psychometricians and valued-added model designers stress), we now demand more from the tests than can be obtained with sufficient precision.'”(more)