Bob Shepherd, a frequent commenter here, has been a curriculum writer, as assessment developer, a publisher, and a classroom tea her. As frequent readers of this log know, he is also a polymath, with a broad, nearly encyclopedic range of knowledge.

In this essential post, he explains why standardized testing is invalid and useless for accountability purposes.
They do not measure what they claim to measure.

Here is a brief excerpt from a brilliant explanation:

Nothing that students do on these exams even remotely resembles what real readers and writers do with real texts in the real world. Ipso facto, the tests cannot be valid tests of actual reading and writing. People read for one of two reasons—to find out what an author thinks or knows about a subject or to have an interesting, engaging, significant vicarious experience. The tests, and the curricula based on them, don’t help students to do…