Carol has authored several books for ASCD, including How to Differentiate Instruction in Mixed-Ability Classrooms, The Differentiated Classroom, and (with Caroline Cunningham Eidson) Differentiation in Practice: A Resource Guide for Differentiating Curriculum, Grades 5–9. She consulted on and authored facilitator's guides for ASCD video staff development sets and developed ASCD's Professional Inquiry Kit on Differentiated Instruction.