Reducing class size shouldn’t be the priority in urban districts, writes Andrew Rotherham in the NY Daily News.
. . . reducing class size without addressing teacher quality more broadly is akin to continually adding pitchers to your bullpen without worrying about whether any of them can even throw a fastball.
If there aren’t enough good teachers to handle the increased number of classes, the poorest kids end up with the least-trained teachers. That happened in California when class size was cut to 20 students in K-3. For many students, the benefits of smaller classes — evidence shows a clear benefit in kindergarten and first grade — were cancelled out by the decline in teacher quality.
Here’s the other side of the issue.