COMPASS^®/ESL is a comprehensive computerized adaptive testing system that helps place students into appropriate courses and maximizes the information postsecondary schools need to ensure student success. COMPASS^®/ESL offers placement and diagnostic testing in mathematics, reading, and writing, and now includes placement testing for English as a Second Language (ESL) students. ACT has combined COMPASS and ESL measures with advising, course placement, and retention services into one complete package.