This document summarizes the efforts of one adult ESL program to improve student retention rates. The program historically had low retention of around 50% from the first month to the end of class. To address this, a retention task force developed several interventions including managed registration, enrollment in 10-week terms, adoption of a core textbook, and addition of a new student success class. These changes resulted in a 21% increase in retention rates within a year and higher rates of students completing levels and earning job certificates. Teacher and student feedback on the changes was largely positive.