Duncan said, however, that information about teachers should be released "in the context" of other measures. And, he expressed concerns that Los Angeles teachers are having to turn to The Times for their value-added scores.
The Times plans to publish a database containing the value-added rankings of about 6,000 third- through fifth-grade teachers later this month. As of Tuesday afternoon, nearly 1,700 teachers had asked for and received their scores from the newspaper.
"It is unfortunate they had to wait for a newspaper to share this information with them in such a public way," Duncan will say.
He will also decry a reluctance to identify effective teachers and see if the secrets of their success can be duplicated.
He will cite Nancy Polacheck, a highly effective fourth-grade teacher featured in a Times story who was reluctant to be recognized for her accomplishments.
"That shame of success has pervaded America's educational culture for far too long," he will say. "We should celebrate Nancy Polacheck and the many effective teachers like her.... However, our system keeps all our teachers in the dark about the quality of their own work."
Times staff writer Howard Blume contributed to this report.