This action research was conducted to determine the effectiveness of computer aided instructions in teaching Science subject to Grade Three pupils for the school year 2016-2017.

The research used Grade Three-10 pupils as the respondents of the study. The researcher utilized personally designed computer aided materials to monitor in teaching Science subject of the respondents from motivation to evaluation.

The research will benefit the pupils because they will be motivated to study and participate in the teaching-learning process in Science subject that will lead an increasing of mastery level on the said subject. It will also give opportunity for the teachers to explore the benefits of using computer aided materials by enhancing their skills in computer that will make them a 21" century educator ready to take challenges brought by the modernization of the Department of Education.