Eight years ago, Chicago Public Schools launched a program that gave certain principals more control, such as more flexibility over budgets and being freed of extra oversight from district leaders. It was an effort to reward effective veteran school leaders with “more leadership and professional development opportunities.”

Now, a new study by a Northwestern University professor shows that the initiative — known as the Independent School Principals program, or ISP — resulted in better test scores and school climates and could be a cost-effective way to improve schools.

The analysis looked at 44 elementary schools that joined ISP between 2016 and 2018. Those schools saw pass rates for state reading and math tests grow, on average, by about 4 percentage points more than similar schools that weren’t part of ISP, according to the study. (Comparison schools were chosen based on things like demographics and test scores.)

The findings suggest that schools can benefit from more empowered principals, who are “closer to the ground” and may have a better sense than district leaders of what their students need, said C. Kirabo Jackson, an education and social policy professor at Northwestern who conducted the study.

But there are some caveats, Jackson said. The ISP schools with the best test score results were also run by principals who are considered “highly effective,” as determined by teacher ratings and other evaluations. Less effective principals saw test scores grow at a slower rate. Other studies have found mixed results when giving schools more autonomy, Jackson noted in his study.

The benefits of such a policy depend on “the capacity of the leaders to manage on their own,” said Jackson.

Test scores don’t show the full picture of how well students are doing, Jackson said, and his study found mixed results in other areas. For example, ISP schools on average had better ratings for school climate. But he found no evidence that these schools saw better student or teacher attendance.

Read the full article about independent school principals by Reema Amin at Chalkbeat.