These two parallel reports provide data on course attrition rates in the Maricopa County Community College District for Fall 1978 and Spring 1979. Course attrition rates were calculated by comparing high-point enrollments (which include audits and withdrawals) with end-of-semester enrollments (which do not include audits, drops, withdrawals, or withdrawals-failing, but do include students with grades A through F, passing, incomplete, no credit, and non-graded). Tables and graphs present these data by college for day and evening enrollments for a selection of departments and courses. After describing and summarizing the data, each report looks at course attrition by department (i.e., all classes, accounting, administration of justice, art, humanities, biology, chemistry, data processing, economics, electronics, English, English humanities, general business, health, history, home economics, mathematics, music, music performance, nursing science, office education, philosophy, physical education, physics, political science, psychology, reading, sociology, Spanish, and speech). Additionally, attrition rates in selected classes are presented, including courses in accounting, data processing, freshman English, business, history, arithmetic, algebra, and psychology. Finally, both reports look at course attrition, for Fall 1973 through Spring 1979, at the district as a whole and at each of its six campuses. (AYC)