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Could the LA Times' decision to publish teachers' value-added scores have a chilling effect on school research? That question came to me as I read about a case in Arizona. Arizona officials are seeking the names of teachers and schools that took part in a study of the state's policies on teaching English, even though those teachers and schools were promised that their names would remain confidential. Needless to say, many in the research community are none too pleased.

The UCLA study found that the state's ESL policies were doing more harm than good. The state isolates English language learners so they can study only English for several hours every day. UCLA researchers found that this practice does not narrow learning gaps but does raise the specter of segregation. State Chief Tom Horne argues that he cannot rebut those findings without full access to the data used in the survey.

His opponents counter that schools will never again open the doors to researchers if they feel their anonymity is at risk. Researchers (like many reporters, I might add) will often go to great ...

It is fast becoming a received truth that teachers, teachers, teachers make all the difference in a child's academic performance. But what if analysis of students' scores on state tests threw that belief into question? It may have in L.A.

That's not the impression you'll get from the recent L.A. Times story on teacher quality. The Times used student test data to estimate 6,000 L.A. teachers' relative effectiveness. The  story suggests that it's all about the teachers:

Year after year, one fifth-grade class learns far more than the other down the hall. The difference has almost nothing to do with the size of the class, the students, or their parents.

It's their teachers.

But blogger Corey Bunje Bower had a look at the report behind the Times analysis, and he drew another conclusion. The Times notes that the best teachers aren't all crammed into the "best" schools. Bower weighs the implications of that finding:

Teacher quality varies widely within schools--just as with test scores, there's far more variation within schools than across schools. ("Teachers are slightly more effective in high- than in low-API schools, but the gap is small, and the variance across schools is large"). Which means that the highest performing schools don't have all the best teachers and the lowest performing schools don't have all the worst teachers. Which means that something other than teacher quality is causing schools to be low and high performing. Which means we should probably focus our attention on more than just teacher quality.

Of course teachers are very important. Why would anyone teach if teachers didn't matter? But should we put ALL our eggs in the teacher basket?

Other bloggers have raised strong objections to the L.A. Times piece. Can we trust the tests? Can we trust "value-added" analysis of test scores? Is it right to publish names and even pictures ...