Providing clear guidance to teachers is not a straightforward task for school systems: Teachers get information about what to teach and how to teach from many sources, some of which are beyond the control of school systems. When teachers get different, even conflicting, messages about what and how to teach from various sources, they likely…

Just as teachers' perceptions of instructional materials influence what they do with those materials, school leaders' perceptions of instructional materials influence their decisions about how and how strongly to support teachers' material use. The authors address a gap in existing literature by identifying what school leaders regard as key…