Abstract This study investigated the development of discourse features in young learners of a foreign language (YLLs), focusing on their complexity, accuracy, fluency (CAF), and vocabulary. The study also examined the relationship between CAF and communicative adequacy, and the influence of YLLs’ socio-economic status (SES) on discourse development. The participants were Grades 5, 8, and 10 learners of English in China (32 students in each grade level) who were selected through a stratified random sampling from a larger project and 15 advanced adult learners of English as a comparative group. They engaged in a story-telling task using a wordless picture book. The participants’ communicative adequacy was operationalized as the narrative structure based on story grammar, and 17 discourse features representing CAF were examined across grade levels and SES groups. A series of ANOVA and correlational analyses found that CAF measures generally showed significant differences by grade with some varied patterns reflecting the multidimensional natures of CAF constructs. SES effects appeared in secondary school levels. CAF measures were not interrelated significantly in Grade 5 but showed greater interrelatedness within and across dimensions among students in higher grades. Fluency contributed most to the communicative adequacy measured by story grammar, followed by vocabulary.
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