C3WP has been extensively researched. SRI conducted independent research in two studies, both finding positive results. The Learning Policy Institute’s study of effective professional development features the National Writing Project’s C3WP program as an exemplar.
Each C3WP Cycle of Instruction involves teachers teaching a C3WP Instructional Resource. C3WP offers Upper Elementary and Secondary Instructional Resources for teachers to choose from based on students' skills in argument writing. Teachers can access the resources in the Instructional Resources Guides below.