Abstract:
The purpose of this research were to 1) develop a computer assisted instruction program on English vocabulary for grade 4 students in Prachinburi Primary Education Service Area Office 2 and have it meet the criterion of 75/75, 2) compare the students vocabulary learning achievements using the criterion of 60 %, and 3) evaluate the students satisfaction toward using the computer assisted instructions program. The sample used in this consisted of 22 grade 4/1 students of Banhanwittaya school in Prachinburi Primary Education Service Area Office 2 studying in the first semester of the academic year 2014. Judgment sampling was used to select a suitable school and simple random sampling was use to select the sample. The instruments used for gathering the data were a 50-item achievement test with a reliability of 0.87 and a 10-item questionnaire designed to measure student satisfaction. The statistics used in this research were mean, standard deviation, One Group Post Test Design and E1/E2 to determine the efficiency of the program. The findings of the research were as follows: 1. The efficiency of the computer assisted instruction program on English vocabulary for grade 4 students was 76.25/78.32 which met the criterion of 75/75. 2. The students vocabulary learning achievements after using the computer assisted instruction program on English vocabulary for Grade 4 students was higher than the criterion of 60 % as it was at 85.45 % 3. The students level of satisfaction toward using the computer assisted instructions program on English vocabulary for Grade 4 students was at a high level.