In a distressed neighborhood north of Miami's gleaming downtown, a group of enthusiastic but inexperienced instructors from Teach for America is trying to make progress where more veteran teachers have had difficulty: raising students' reading and math scores.
"These are the lowest performing schools, so we need the strongest performing teachers," said Julian Davenport, an assistant principal at Holmes Elementary, where three-fifths of the staff this year are Teach for America corps members or graduates of the program.
By 2015, with the help of a $50 million federal grant, program recruits could make up one-quarter of all new teachers in 60 of the nation's highest need school districts. The program also is expanding internationally.
That growth comes as many districts try to make teachers more effective. But Teach for America has had mixed results.
Its teachers perform about as well as other novice instructors, who tend to be less successful than their more experienced colleagues. Even when they do slightly better, there's a serious offset: The majority are out of the teaching profession within five years.