The purposes of this research were to compare the students’ achievement before and after using English Discoveries Online, and to investigate the satisfaction of using English Discoveries Online in the first semester of the academic year 2017 at Buriram Rajabhat University. The research instruments comprised a set of courses on English Discoveries Online; the randomized exit-test only control group design method was employed. Statistical analyses revealed significant differences in language proficiency. Findings are as follows: 1) the academic achievement of the students instructed by EDO was higher than those studied in the classroom. And 2) the students’ satisfaction with the instruction using EDO was higher than learning without EDO.
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