The Effect of Six Thinking Hats and Critical Thinking on Speaking Achievement

The Six Thinking Hats (STH) is an interesting strategy, which requires students to think and discuss an issue from different points of view. The objectives of this study were to find out the students' speaking achievement after being taught by the STH, the interaction effect of STH and critical thinking on students' speaking achievement and speaking achievement among the students who had high, mid and low levels of critical thinking. Factorial design was used in this study, which involved experimental and control groups. The sample of this study covered 48 students that were equally divided into experimental and control group. The result showed that the experimental group had better improvement in speaking achievement than the control group. However, there was a partial significant interaction effect of the STH and students' critical thinking on speaking achievement, which was on pronunciation aspect. Besides, the results also showed there were significant differences among the levels of students' critical thinking in the experimental group especially in comprehension, pronunciation, and fluency aspects.