This casebook is part of a set of materials written by the members of the Making Thinking Visible Project. It offers high school, college, and community college teachers' multiple perspectives on the teaching and learning of collaborative planning, and on classroom inquiry and practice. The casebook explains collaborative planning (a writing strategy that helps students develop a piece of writing by discussing key rhetorical considerations with a partner) and suggests ways that teachers may want to use this technique as part of the way they teach writing. It offers 14 articles in 3 sections. The first section, "Clarifying Concepts," includes "Introduction to Collaborative Planning and the Making Thinking Visible Project" (Linda Flower and others); "Reflecting Upon Our Project" (Nancy Nelson Spivey); "Writers Planning: Snapshots from Research That Helped To Frame Collaborative Planning" (Linda Flower); and "Engaged, Involved Supporters: Keys to Effective Collaboration" (Rebecca E. Burnett). The second section, "Tracing Processes," includes "An Investigation into the Process of Critical Thinking and Collaborative Planning" (Leonard R. Donaldson); "The Right Metaphor" (Michael A. Benedict); "Planners' Options: A Collaborative Planning Tool Helping Inexperienced Writers/Planners Make Thinking Visible" (Thomas Hajduk); "Transforming Topic Knowledge: Six Portraits of Collaborative Planning" (David L. Wallace); "Transferring Talk to Text" (Jane Zachary Gargaro); "Student Teachers and Collaborative Planning: Transfer and Adaptation from Representation to Practice" (Linda Norris); and "Collaborative Planning and the Classroom Context: Tracking, Banking, and Transformation" (Jean A. Aston). The final section, "Adapting Assignments," contains "A Beginner's Map: From Collaboration to Collaborative Planning" (Leslie Byrd Evans); "Actual Classroom Experiences Using Collaborative Planning" (Andrea S. Martine); and "A Reflective Look at Teaching Planning in High School" (Karen Gist). Notes on the editors and contributors are attached. (PRA)