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The samples of this study were 22 students drawn group randomly from the Prathommasuksa 5 students in
the second semester of academic year 2009 in Ban Tung Siean School, in Samotong sub district, Tachana district,
Surattanee province. The research instruments were 10 training lesson plans of Six Thinking Hats model and the
critical thinking ability test. The data were analyzed by percentage, arithmetic mean, standard deviation and t-test.
The research results revealed that:
1. The students’ critical thinking ability after the training was significantly higher than before at the .01
2. The students who received the training of the Six Thinking Hats model had critical thinking ability
after the training at 82.42 percent significantly higher than the prescribed criterion at .01 level.
Keywords: Six thinking hats model, Critical thinking
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