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The objectives of this study were 1) to compare the abilities of communicating Thai as a foreign language after the experiment between the experiment group and the control group, and 2) to compare the abilities of communicating Thai as a foreign language of the experiment group between pre-intervention and post-intervention periods. The sample of this study consisted of non-native Thai students and half Thais (with a non-native Thai mother or father) who have studied Thai language and culture at year 3 education level in international schools. They were non-native speaking Thais using Thai as second language. The research instruments include a set of activities of communicating Thai as foreign language according to task-based learning and sociolinguistic theories for primary education students and a test of communicating Thai as foreign language. Data were analyzed using basic statistics. This study was a quasi-experimental research using Group Pretest-Posttest Design. The results of this research could be concluded that 1) at post-intervention period, the experiment group had higher performance of communicating Thai as foreign language than the control group with a statistical significance level of .05, 2) the experiment group at post-intervention period had higher performance of communicating Thai as foreign language than that at pre-intervention period with a statistical significance level of .05.
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