“…In order to do that, engineering students need to develop their skills in using background knowledge to questions gained information, analyzing complex issues, synthesizing information to make reasonable conclusion, evaluating the data, and solving challenging problems. However, previous research on the use of critical thinking in Engineering mainly investigate students' perspective on critical thinking definition and activities (Douglas, 2012), how critical thinking is used to solve operational chemistry and physics problems (Özsoy-Güneş, Güneş, Derelioğlu, & Kırbaşlar, 2015), and the development of critical thinking for non-calculus ready students (Santiago, Coolbaugh, & Veeramachaneni, 2016). How engineering students develop their critical thinking through speaking practice seems overlooked.…”