Computer-based instruction (CBI) was used to teach 3 sets of 20 spelling words to two 6th graders in a multiple baseline design. The CBI presented a voice recording of each spelling word and prompted the students to type the word. If they spelled the word incorrectly, a training procedure was initiated that included prompt fading and systematic review practice. Results showed that three to ten 15-min training sessions were needed for participants to score 100% on each word set. During a subsequent maintenance phase, one participant received 2 re-training sessions on word Set 2 due to low performance but no other training was provided. Average performance was 93% across all word sets during the final three sessions of the maintenance phase and 79% on a 3-week follow-up test.