[caption id="attachment_121255" align="alignleft" width="150"] Effective leaders know how to distinguish core values from practices, Collins said—preserving the former while changing the latter to stimulate progress. (Lifetouch/AASA)[/caption]

The most important factor influencing a school’s success isn’t class size, length of the school day, or other reforms, says researcher and author Jim Collins—it’s having a great leader at the helm.

Speaking at the American Association of School Administrators’ National Conference on Education Feb. 21, Collins told the superintendents in attendance that the best thing they could do...

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