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In this study the relative importance of linguistic knowledge, metacognitive knowledge, and fluency or accessibility of this linguistic knowledge in both first language (L1; Dutch) and second language (L2; English) writing was explored. Data were collected from 281 grade 8 students. Using structural equation modeling, the relative importance of the three components was studied and compared across L1 and L2 writing. The results showed that the fluency measures were correlated with overall writing performance in both L1 and L2. However, when compared to linguistic knowledge resources, these fluency measures turned out to have no additional value in predicting L1 or L2 writing performance. L2 writing proficiency turned out to be highly correlated with L1 writing proficiency, more than with either L2 linguistic knowledge or the accessibility of this knowledge.
Schoonen et al. (Sat,) studied this question.