To enhance student performance, prevent attrition, and build a learning community, two courses were linked together by requiring concurrent enrollment. "Writing Effectively," an upper-division composition course, was linked with "Abnormal Psychology," an upper-division clinical psychology course, requiring concurrent enrollment in both. In short, "Writing Effectively" was the "treatment" for linked course students studying "Abnormal Psychology." In "Writing Effectively," the students worked on mastery of APA style, argument and research for their "Abnormal Psychology" papers, and peer review of research paper drafts. In evaluating the linked courses, the authors were interested in answering the following questions: (1) Do students in linked courses perform better academically than students in the same, unlinked courses?; (2) Are students in linked courses less likely to drop out of the course(s) before the end of the quarter?; and (3) Do students in linked courses report greater satisfaction of their learning experiences? Students in an unlinked class were used as a comparison group. Grades, evaluations, and attrition rate suggest that linking courses can improve writing and exam scores and reduce attrition.