Value-added models of teacher effectiveness are highly unstable. Teachers’ ratings differ substantially from class to class and from year to year, as well as from one test to another.

Value-added teacher evaluation has been extensively criticized and strongly defended, but less frequently examined from a dispassionate scientific perspective. Among the value-added movement’s ...

Given that 'value-added' methods of assessing teachers are known to be unreliable, is there yet a way to use them in evaluation? Here's a case for it by an assessment expert from Tulane University.

Los Angeles school district leaders are poised to plunge ahead with their own confidential 'value-added' ratings this spring, saying the approach is far more objective and accurate than any other ...

The Los Angeles Times has now posted online their controversial database of teachers' value-added performance. This is extremely interesting if you are an LA teacher or have a child in that system ...

lew of recent news stories from across the country about good teachers getting tripped up by flawed performance measures. The common villain: So-called value-added models -- i.e. VAMs -- in which ...

The Courant’s teacher evaluation editorial falls into a common trap: ignoring basic statistics [April 23, Opinion, “Back To Squishy Teacher Evals”]. Claiming that student performa… ...

Raj Chetty and John N. Friedman, economists at Harvard, and Jonah E. Rockoff of Columbia co-wrote the recent study "The Long-Term Impacts of Teachers: Teacher Value-Added and Student Outcomes in ...

"Value-added analysis” has been used to fire public school teachers who failed to measure up. In Los Angeles, the value-added rankings of 6000 teachers were published on line. We hear about the ...

A StateImpact Ohio/Plain Dealer analysis finds little connection between how much Ohio teachers are paid and how well they are rated under the state's new 'value-added' measure.

In Houston, school district officials introduced a test score-based evaluation system to determine teacher bonuses, then — in the face of massive protests — jettisoned the formula after one ...

Raj Chetty and John N. Friedman, economists at Harvard, and Jonah E. Rockoff of Columbia co-wrote the recent study "The Long-Term Impacts of Teachers: Teacher Value-Added and Student Outcomes in ...