In fall 1990, Johnson County Community College (JCCC) in Overland Park, Kansas, conducted a study of the effectiveness of the college's developmental reading, English, and mathematics courses. The study examined developmental students' course grades and completion rates, grades in related college-level courses, overall academic progress, and scores on standardized assessment tests taken before and after the developmental course. The study population included 1,011 students enrolled in developmental reading from fall 1986 through spring 1990, 292 students enrolled in developmental English in fall 1990, and 1,126 students enrolled in developmental mathematics courses between fall 1986 and fall 1990. Study highlights included the following: (1) students in developmental reading and English courses showed significant gains on standardized tests near the end of their remedial courses; (2) students in developmental courses completed approximately 20 credit hours at the college; (3) developmental students' grade point averages (GPA's) dropped significantly in the semester following their developmental work, but then increased gradually; (4) developmental students generally achieved passing grades in college-level courses related to their developmental courses, though both their grades and course completion rates were lower than the college-wide averages in those same courses; and (5) developmental reading students graduated (i.e., received a degree or certificate) at a rate slightly more than one-half that of the student body as a whole. Also, developmental English students' graduation rates approximated those of students college-wide, while developmental math students graduated at a rate nearly twice the college-wide average. Detailed data tables are included. (PAA)