The latest cover story in Newsweek focuses on the negative impact teacher tenure has on student performance in public schools. Authors Evan Thomas and Pat Wingert must have been hanging out with colleague Jonathan Alter, a frequent critic of the role teachers? unions have played in keeping bad teachers on the job.

Thomas and Pat Wingert also take aim at ineffective collegiate teacher training programs:

Yet in recent years researchers have discovered something that may seem obvious, but for many reasons was overlooked or denied. What really makes a difference, what matters more than the class size or the textbook, the teaching method or the technology, or even the curriculum, is the quality of the teacher. Much of the ability to teach is innate?an ability to inspire young minds as well as control unruly classrooms that some people instinctively possess (and some people definitely do not). Teaching can be taught, to some degree, but not the way many graduate schools of education do it, with a lot of insipid or marginally relevant theorizing and pedagogy. In any case the research shows that within about five years, you can generally tell who is a good teacher and who is not.

It is also true and unfortunate that often the weakest teachers are relegated to teaching the neediest students, poor minority kids in inner-city schools. For these children, teachers can be make or break. “The research shows that kids who have two, three, four strong teachers in a row will eventually excel, no matter what their background, while kids who have even two weak teachers in a row will never recover,” says Kati Haycock of the Education Trust and coauthor of the 2006 study “Teaching Inequality: How Poor and Minority Students Are Shortchanged on Teacher Quality.”

Speaking of Kati Haycock, you might remember her criticism in March 2008 of North Carolina?s school accountability standards.