This study aimed at investigating the effect of Preview, Question, Read, Summarize (PQRS) Strategy on EFL students’ writing ability by considering their working memory capacity (WMC) levels. It involved Indonesian English as a foreign language (EFL) students of English Department in Universitas Negeri Malang, one of the leading universities in Indonesia. This study applied a quasi-experimental design and compared the writing ability of two intact groups of students. The data were collected by using writing tests and a WMC test. The results of the research revealed that there was a significant difference between the students who were taught by using the PQRS strategy and those who were not taught by using that strategy. However, there was no significant difference in the writing ability of the EFL students across WMC levels. Theoretically, this study supports the important roles of integrated reading-writing instruction in the teaching of writing. Pedagogically, in the teaching of writing, EFL teachers might apply the PQRS strategy as part of integrated reading-writing instruction to EFL students regardless of the difference in their WMC levels.
