A research project sought to develop and demonstrate the use of a spelling program taught to sixth graders by computer-assisted instruction (CAI). Students from three schools were divided into low-, medium-, and high-ability spellers; the individuals at each level were then assigned to either an experimental or a control group. The former used the CAI program SPELL, relying upon an IBM 1410 system and the COURSEWRITER I language; the latter received conventional instruction. Posttesting after 15 weeks indicated no significant overall differences between the two treatments; significant gains for low-ability students from one school were noted, irrespective of treatment, and for low- and medium-ability students in the CAI group in a second school. It was also learned that the pupils accepted CAI despite some hardward problems, that is was possible to discern the mode by which individual students learned best, and that school personnel could be trained to use CAI. It was concluded that CAI could individualize spelling instruction, and it was recommended that additional research study the use of CAI methods, particularly with low-ability students. (PB)