States, districts, and schools all across the United States are busy developing or implementing teacher evaluation systems. One can trace this flurry of activity to a variety of reports and initiatives that highlight two failings of past efforts: (1) Teacher evaluation systems have not accurately measured teacher quality because they've failed to…

Discusses how schools can avoid mistakes in building their school-improvement plans. The two most common mistakes are (1) using measures of student learning that are not sensitive to the actual learning occurring, and (2) having no system for interpreting and using the data. (Contains 1 figure and 11 references.) (WFA)