The first research objective was to investigate the effects of using communicative activities on the English speaking abilities of Matthayomsuksa 3 students. The hypothesis was tested on students by using two instruments: English
speaking tests and a speaking observation form. The pre-test and post-test scores were assessed by three raters, which were calculated statistically. To test the hypothesis, the mean scores and SD scores on pre-test and post-test were compared by using an independent t-test.