In an attempt to develop a metacognitive writing questionnaire, Farahian (2015) conducted a study which was based on the results obtained from a semi-structured interview (Maftoon, Birjandi & Farahian, 2014). After running various exploratory factor analyses (EFA) to validate the questionnaire two general scales of knowledge and regulation of cognition emerged; however, regarding the subscales of knowledge and regulation of cognition no clear pattern was found. As such, in the present study a confirmatory factor analysis (CFA) was run to refine the scale and construct the final questionnaire. The findings led to a hypothesised model comprising two factors of knowledge of cognition and regulation of cognition with ten subcategories represented in a 36-item questionnaire.