Book excerpt: In the instruction and learning process, the role writing plays has often been overlooked. Writing is thinking! It is a tool for learning in all content areas. The ever-growing body of brain research supports that learning to write transitions into writing to learn as students progress through upper elementary, middle, high school, and college. Writing is much more than the ability to craft an analytical essay. Writing has the potential to engage students in critical thinking and critical reflection as historians, mathematicians, scientists, or experts in any content area. Writing is Thinking explores methods and activities to effectively incorporate writing to help learners successfully master, analyze, apply, and express content knowledge.