My TIME column last week was about our lousy national debate about teaching quality. But although it was toward the bottom this paragraph sparked a lot of debate:
When Stanford University economist Eric Hanushek looked at teacher performance he found that removing even the lowest five percent of performers could boost overall student achievement substantially. There are two key takeaways from this research. First, the lowest-performing teachers have a negative effect on student performance that is disproportionate to their numbers. Second, in practice this amounts to just one or two teachers per school on average. Most workplaces have similar problems.
Historian Diane Ravitch and Hanushek disagree about this point and agreed to discuss it here on Eduwonk next week. Thanks in advance to both of them for that. So addition to regular content look for that debate to start on Monday.