Critical thinking is one of the important characteristic that sees as center of the higher education (Kuhn, 1999).  Critical thinking is an essential process not only for learning but also for cognitive development  Epstein (1999). Ennis (1962) define critical thinking as a logical and product-oriented operation and idea of statements. According to Akar (2007) critical thinking requires thinking deeply, being active, conscious, having purpose, interrogating, judging, thinking what to believe or not believe and what to do and considering all these during decision process. According to Chaffee (1988) critical thinking is our real, aimed and totally organized efforts by observing our other peoples thoughts carefully in order to understand our world and to reveal and improve our understandings. Critical thinking skills refer to some abilities such as analyzing, synthesizing and evaluating information and tendency of applying them (Halpern, 2001).

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