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At the same time, writing is often considered as the most difficult skill to be mastered because of its complexity (Hapsari, 2011). Writing is a progressive skill, and students need the opportunity to practice writing, receive feedback, and rewrite to develop and improve their skills and understanding of the material (Blankenship & Wilson, 2009). Researchers (Ellis, 2003; Ellis & Barkhuizen, 2005; Skehan 1998) are now in agreement that L2 proficiency, in general, and writing proficiency, in particular, are multi-componential in nature, and that their principal dimensions can be adequately and comprehensively captured by the notions of complexity, accuracy and fluency (CAF; Housen and Kuiken, 2009).
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