In "The Irreplaceables," TNTP researchers argued that America's urban schools take a negligent approach to teacher retention, losing too many of their very best teachers--their "Irreplaceables"--and keeping too many of their weakest teachers, year after year. A combination of weak school leadership, poor working conditions and restrictive policies…

Discussions of teacher turnover usually focus on "how many" teachers leave schools each year, without regard for their performance in the classroom. This oversimplification masks the real teacher retention crisis: not only a failure to retain enough teachers, but a failure to retain the "right" teachers. This executive summary presents findings of…

Successful teachers make successful schools. Yet some schools are better than others at accelerating student learning by developing and keeping great teachers, even compared to schools that serve the same population of students and have access to the same resources. These schools are called "greenhouse schools"--schools with carefully fostered…