Many students have difficulty in educational and employment settings because they have failed to master basic writing skills. Multiple-baseline across-tasks designs were used to evaluate the effects of the Comprehensive Writing Program (CWP), a multicomponent intervention, on the writing performance of all students (n = 17) from 3 9th-grade special education classrooms. The CWP included direct instruction, assignment choice, increased practice, group rewards, and individual feedback. Assessment procedures were used to collect data on 3 target skills: percentage of sentences that (a) were complete sentences, (b) contained adjectives, and (c) were compound sentences. Results suggest that the CWP increased students' performance on recently taught or retaught skills; however, not all increases were maintained. Discussion focuses on future applied and theoretical research designed to address limitations of the current study and to enhance the effectiveness of the CWP. (Contains 1 table and 3 figures.)