This study examined how intermediate-level Japanese EFL students’ written English changed over 15 weeks. The study aimed to identify measures of students’ L2 short-term writing development in terms of fluency, syntactic, and lexical complexity. Two groups of undergraduates, who differed in prior writing background, received an English writing course of similar content. The study first compared pre- and post-course English compositions within each group, and then between-group comparisons of the pre- and post-course compositions were made, respectively. Nine linguistic measures were employed including raw fluency, and ratio measures of syntactic and lexical complexity. The results revealed that the less experienced students showed a significant increase in fluency, lexical complexity, and one syntactic complexity measure (number of T-units per sentence), whereas the more experienced students made no significant changes in any measure. Based on the findings, implications are discussed and several directions for future research are provided.
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