This study explores the influence mechanism of literacy strategy use and independent language skills (e.g., reading and writing) on integrated writing (IW) performance. 322 Secondary Four students from four schools in Hong Kong completed single-text reading, multiple-text reading, independent writing, and IW tasks, along with questionnaires investigating their reading strategy use and IW strategy use. Path analyses revealed that multiple-text reading and independent writing had comparable significant impacts on IW, mediating the influence of single-text comprehension. In addition, reading strategy use impacted IW indirectly through independent literacy skills and IW strategy use, while IW strategies exerted a direct influence on IW. Our findings underscore the critical role of language skills in mediating the influence of reading strategies on IW performance among young first language (L1) learners. The implications for research and practice, are discussed, emphasizing the complexity of the IW construct and the need for balanced language skills and strategy instruction to enhance IW task performance. • A noble exploration of concurrent effects of strategies and independent skills on IW. • Multiple-text reading and independent writing directly influence IW performance. • Independent skills mediate the impact of reading strategies on IW performance. • Reading strategy indirectly affect IW through independent skills and IW strategy. • Balanced language skills and strategy instruction are crucial for IW performance.

Task representation denotes students’ interpretation in which what a learning or assessment task required them to do. An argumentative integrated writing task which involves the use of reading materials as claims or evidences for composing an essay, makes the role of task representation more critical than others, as writers may be confused with whether their task is to focus on synthesizing the reading materials that they comprehend, or expressing their own views. With the aim of exploring the characteristics of task representation and its association with integrated writing, this study invited 474 secondary four students from Hong Kong to participate in think aloud writing protocol followed by stimulated recall interview (36 participants), and complete an integrated writing task and a questionnaire (438 participants). Three factors of the task representation were identified as source use, rhetorical purpose and text format, and significant positive correlations were found between the three factors and integrated writing performance. Theoretical and pedagogical implications are discussed.