Abstract:
The purposes of this research were 1. to compare the pretest mean scores of CEFR grammatical test between the experimental group and the control group before using CEFR-based
worksheets; 2. to compare the pretest and posttest mean scores before and after using grammatical worksheets based on CEFR within the experimental group; 3. to compare the pretest and posttest mean scores within the control group, and 4. to compare the posttest mean scores between the experimental group and the control group. The sample was the 68 first year students of College of Fine Arts, Lardkrabang, Bangkok. They were selected through a purposive sampling technique consisting of 34 students in the experimental group and 34 students in the control group. Both groups did a pretest and a posttest. The pretest and posttest scores of both groups were analyzed through the statistical application of percentage, mean standard deviation and t-test for dependent and independent samples. The results were 1. the overall pretest mean scores of the experimental group and the control group were not different ; 2. the overall posttest mean scores of the experimental group were significantly higher than the pretest mean scores at the level of .01; 3. the overall posttest mean scores of the control group were significantly higher than the pretest mean scores at the level of .01, and 4. the posttest mean scores of the experimental group were significantly higher than the posttest mean scores of the control group at the level of .01.