Teachers' Ratings Still High Despite New Measures

Changes to evaluation systems yield only subtle differences

The figures are resoundingly familiar.

In Michigan, 98 percent of teachers were rated effective or better under new teacher-evaluation systems recently put in place. In Florida, 97 percent of teachers were deemed effective or better .

Principals in Tennessee judged 98 percent of teachers to be "at expectations" or better last school year, while evaluators in Georgia gave good reviews to 94 percent of teachers taking part in...