Principals are above all supposed to be “instructional leaders [1]” but exactly what that means — or how to be effective in that role — isn’t entirely clear, the Washington Post reports. Cognitive scientist Daniel Willingham looks at the research on what makes for an effective instructional leader in the post below. Willingham is a professor and director of graduate studies in psychology at the University of Virginia and author of “Why Don’t Students Like School? [2]” His latest book is “When Can You Trust The Experts? How to tell good science from bad in education. [2]”