English is a language, which is spoken by numerous people across the world.  It has acquired a prominent place in meeting the communicational needs of the people. Grammar is a set of rules that helps the people to use the language better. In schools, the teachers of English are considered as the most important factor in making the study of English Grammar successfully. We all know the teachers are experts in their subjects, but faces problems while teaching, because of the overcrowded classroom and heterogeneous group of students. This problem can be overcome by the application of innovative teaching technology. The most striking innovation in the field of educational technology is the application of Computer Assisted Instruction (CAI) in different mode. It makes the children more creative and providing them with an individualized environment. One of the most vital developments in school system is to meet the individual difference among the learners in a satisfying way. Considering the above, the investigators have developed and standardized a CAI package using Macromedia Flash 8 software for learning English Grammar —Voice for Eighth standard students. The selected content Active and Passive Voice is one among the important section in English Grammar. In this study, the quasi-experimental within and between the group pre-test and post-test design was adopted by the investigators. The investigators have undertaken the experimental study on 89 Eighth standard students of three matriculation schools in Mecheri taluk in Salem. The identified students are allotted randomly for two groups such as control group and experimental group. Pre-test and Post-test were conducted for both the groups. Test of significance difference (t-test) is employed for analyzing the data. The study proves that the learning outcome through CAI is higher than the conventional method. The present study clearly demonstrates that the CAI as individualized self-instructional strategy could be employed for learning English Grammar-Voice in the place of conventional instructional situation.