New research attempts to determine the best way to measure principal effectiveness using students' test scores—and finds that the task is trickier than anticipated.

Principal evaluation presents a number of questions: Should principals be evaluated based on the performance of teachers they didn't hire? Should they be measured for their immediate impact or for growth over time? How can we actually compare one principal to another working in an entirely different school or district context?

In the new research, Jason A. Grissom at Vanderbilt University and Demetra Kolgrides and Susanna Loeb at Stanford University propose and examine several possible methods ...

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