[caption id="attachment_44501" align="alignleft" width="150" caption="Teachers and unions are upset over an online ratings database."]Teachers and unions are upset over an online ratings database.[/caption]

In a move that has many local educators seething, the Los Angeles Times has published an online database comparing more than 6,000 elementary school teachers based on a controversial statistical method that relies on test-score data to determine their effectiveness.

The database, and its resulting fallout, marks the latest chapter in a national debate over how best to measure teacher quality--one that pits members of the Obama administration against many teachers'...

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