Revising Knowledge, part of the Marzano Center: Essentials for Achieving Rigor series, explores explicit techniques for mastering this crucial strategy of instructional practice. Academic standards call for increased rigor, but simply raising complexity is not enough. Students must also be able to deliberately revise their own knowledge. They need to know how to use visual tools, written work, and academic notebooks to make revisions that help to deepen their understanding of the content.