How to think profoundly and how to have an individual voice were and still are two important questions in the realm of education. A great number of learners are not learning critical thinking skill that is the core objectives of general education across all disciplines (McLaughlin, Roth, Glatt, Gharkholonarehe, Davidson, Griffin, & Mumper, 2014). According to Mertes (1991) “Critical Thinking is a conscious and deliberate process which is used to interpret or evaluate information and experiences with a set of reflective attitudes and abilities that guide thoughtful beliefs and actions” (p.24).

These thinking characteristics must be implemented by teachers to allow each learner to have an independent voice. Beyer (1997) recommended that to create a thoughtful classroom context, learners’ thinking should be fully nourished.

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There are several methods to cater to EFL learners’ CT needs, out of which the Six Thinking Hats Method can play an influential role. De Bono (1985) was created this method by considering six different colors for the metaphorical hats to make them more tangible for others. These colors including white, red, yellow, black, green, and blue were designed for various purposes of thinking (De Bono, 1993).

In the figure mentioned by Pang, & Burri (2018) White hat deals with “stating the problem and what we know” (p.119); This is the same as concerning with “Objective facts and figure” (De Bono, 2017, p.18). Red hat stage, on the other hand, deals with “Feelings about the problem” (Pang, & Burri, 2018, p.119) which is also important, because emotional aspects of thinking are greatly in line with motivation to speak. Another hat with Yellow color is concerned with a positive view of the situation and seeing benefits.

Then the Blackcap comes next. De Bono (2017) mentioned some people’s misunderstanding about taking Black hat as a stage which carries bad habits, and asserted that not only it doesn’t have any negative value, but also it provides us with CT skill, because it warns us to avoid harms and sees every negative or problematic aspect of the condition.

Pang, & Burri (2018) continue by referring De Bono’s Green hat stage as looking for possible solutions to the given problem(s) and finally selecting the best possible one; it leads to strengthening the sense of creativity (De Bono, 2017). Last stage but not least one, is in the Blue hat thinking in which one person becomes chairperson and leads the entire stages and reminds members to know in what stage they are when the situation is chaotic. Therefore, the Blue hat stage deals with management (Pang, & Burri,2018).

Considering all stages mentioned above, the STH method also underlies the Metacognitive framework which helps instructors to teach linguistic structures and functional language learning to develop competent learners who can think about their thinking (De Bono, 1993).

The present study then will review two important frameworks of STH (i.e. CT skill and Metacognitive strategies), and the effects utilizing the STH method on fostering these skills. This study also aims at finding the answer to the following question; Do CT skill and Metacognition only limited to Black and Blue hat thinking stages respectively?