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Two and a half years after Florida voters adopted a constitutional amendment to reduce class sizes, Palm Beach County—and every other school district in the state—are tripping over a major stumbling block: There just aren't enough good teachers to go around. With classes in kindergarten through third grade capped at 18 students, fourth through eighth held at 22, and high school limited to 25, the state will need to hire an estimated 29,604 new teachers by 2009—a prospect that has many people worried. "I have every reason to expect that the quality of teachers will suffer," says John Winn, the state's education commissioner.
Nationwide, 33 states now have laws that restrict class size. And the politically popular educational reform. has proved successful in some areas, particularly among the lowest-performing students. In Burke County, N. C. , for example, discipline problems are down and test scores are up, even for the most disadvantaged students in the district. "On paper these kids should not be succeeding, but they are," says Susan Wilson, a former teacher and now director of elementary education in the rural county.
But this success comes at a price. It means hiring more teachers, building more classrooms, and retraining teachers to work with smaller groups of students. And it means, critics maintain, that states pit their own districts against one another in the race to hire. "When you mandate class-size reduction statewide, the suburban schools tend to draw the best new teachers, and the more urban schools, which already have trouble attracting teachers, can't attract the best candidates," says Steven Rivkin, an economics professor at Amherst College who has studied the effects of class-size reduction on teacher quality. Any gains from cutting class size could be undermined by hiring lower quality teachers.
Resources. Proponents contend that the reform. would be relatively pain-less if existing resources were managed well. "Hiring more teachers is only part of the solution," says Charles Achilles, one of the first researchers to study the effects of reducing class sizes. "The best programs for class-size reduction not only hire more teachers but reassign existing specialty teachers to get them back in the classroom. "
Florida policymakers are trying to find their own way out of the class-size quandary. This month, the Legislature is considering a proposal to roll back some of the size limits in exchange for an increase in teacher pay. Gov. Jeb Bush, who opposed the constitutional amendment in 2002, argues that the compromise will attract more top-quality teachers to the state while reining in costs. Voters could see the proposed change on the ballot as early as September. In the meantime, recruiter Pinkos continues his search for new teachers, sometimes working 10-hour days. His pitch？ "Palm Beach is very beautiful, but the
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气压试验前，应对管道及管路附件的耐压强度进行验算，验算时采用的安全系数不得小于()。
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