The purpose of this study was to investigate the results of using computer-assisted instruction to teach basic English grammar material in a senior high school English class. Two experimental groups (one male and one female) consisting of 51 students received computer-assisted instruction as part of the method of instruction, while the control groups (one male and one female) consisting of 63 students did not receive computer-assisted instruction. The design of the experiment involved giving pretests before the units were presented and before the experimental classes began to use the computer and posttests after instruction on five units was completed. Nine null hypotheses were investigated. The results of the analysis of data led to an acceptance of all nine hypotheses. There was no significant difference between the experimental and the control groups. It was recommended that further research be conducted concerning the use of computer-assisted instruction in the teaching of English, that other groups be studied, and that an attempt be made to determine whether computer instruction is an important variable. (Author/LL)