Abstract:
The purposes of the research were to construct the Computer Assisted Instruction on Vocabulary in Thai language subject for Prathomsuksa 5 students, with the efficiency criteria of 80/80 and the effectiveness index value from .50 up; to study the satisfaction of the students towards the Computer Assisted Instruction and to compare the students'learning achievement before and after using the Computer Assisted Instruction. The samples were 30 Prathomsuksa 5 students from Anubarnsongkhla School, Songkhla province. They were selected by simple random sampling. The instruments used in this research were the achievement test with the reliability of .81, the questionnaire with the reliability of .92, and the Computer Assisted Instruction with the efficiency ratio of 82.40/83.73 and the effectiveness index value was .59.The results showed that the average satisfaction of the students towards theComputer Assisted Instruction was at high level with the mean score of 4.38. And the students learned by the Computer Assisted Instruction had the posttest learning achievement higher than the pretest at .05 statistical level of significance.