From N.Y. Times by Motoko Rich:
Tyler Dowdy just started his third year of teaching at YES Prep West, a charter school here. He figures now is a good time to explore his next step, including applying for a supervisory position at the school.

Mr. Dowdy is 24 years old, which might make his restlessness seem premature. But then, his principal is 28. Across YES Prep’s 13 schools, teachers have an average of two and a half years of experience.

As tens of millions of pupils across the country begin their school year, charter networks are developing what amounts to a youth cult in which teaching for two to five years is seen as acceptable and, at times, even desirable. Teachers in the nation’s traditional public schools have an average of close to 14 years of experience, and public school leaders and policy makers have long made it a priority to reduce teacher turnover.

But with teachers confronting the overhaul of evaluations and tenure as well as looming changes in pension benefits, the small but rapidly growing charter school movement — with schools that are publicly financed but privately operated — is pushing to redefine the arc of a teaching career.

“We have this highly motivated, highly driven work force who are now wondering, ‘O.K., I’ve got this, what’s the next thing?’ ” said Jennifer Hines, senior vice president of people and programs at YES Prep. “There is a certain comfort level that we have with people who are perhaps going to come into YES Prep and not stay forever.”

The notion of a foreshortened teaching career was largely introduced by Teach for America, which places high-achieving college graduates into low-income schools for two years. Today, Teach for America places about a third of its recruits in charter schools.

“Strong schools can withstand the turnover of their teachers,” said Wendy Kopp, the founder of Teach for America. “The strongest schools develop their teachers tremendously so they become great in the classroom even in their first and second years.”

Studies have shown that on average, teacher turnover diminishes student achievement. Advocates who argue that teaching should become more like medicine or law say that while programs like Teach for America fill a need in the short term, educational leaders should be focused on improving training and working environments so that teachers will invest in long careers.

“To become a master plumber you have to work for five years,” said Ronald Thorpe, president of the National Board for Professional Teaching Standards, a nonprofit group that certifies accomplished teachers. “Shouldn’t we have some kind of analog to that with the people we are entrusting our children to?”

Teachers’ unions and others in the traditional education establishment argue that charter schools are driving teachers away with longer hours and school years, as well as higher workplace demands. (At YES Prep, for example, all teachers are assigned a cellphone to answer any student call for homework assistance until 9 p.m.)

These critics also say that schools and students need stability and that a system of serial short timers is not replicable across thousands of school districts nationwide.

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