Writing is a fundamental skill students need to be successful. Embedding writing instruction, as well as opportunities to write, into all content areas is key to improving student achievement at the middle and high school levels. The research findings in this ERS publication will help your teachers become successful at incorporating writing activities into their curricula. This publication provides the opportunity for your staff to learn what works in writing instruction and benefit from specific suggestions of how to provide opportunities for writing to reinforce learning. The table of contents provides the following chapters: (1) Writing at the Middle and High School Levels; (2) Learning to Read and Learning to Write--Two Complementary Processes; (3) Teaching Writing--The Fundamentals; (4) Strategies for Writing to Learn; (5) Writing in Mathematics, Science, and Social Studies; (6) Assessment of Student Writing: Purposes, Approaches, and Tools; (7) Helping Struggling Writers; and (8) Taking a Schoolwide Approach.