This longitudinal study examines how speaking performance of senior high school students at a
Super English Language High School (SELHi) in Japan improves across 16 months. The 37
participants, who were frequently exposed to English input, completed a picture-description task
three times. The results showed that some aspects of speaking performance, namely, fluency (as
measured by the number of tokens per minute and by pauses) and complexity (as measured by the
number of clauses and of words per c-unit), developed significantly over 16 months. Moreover, in
some aspects of speaking performance, especially fluency and complexity, effects sizes showed
medium or large degrees of development. The findings of this study and previous longitudinal
studies are consistent, suggesting positive effects on fluency and complexity.
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