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As project-based learning (PjBL) has become very popular in education over the past few years, this study conducted a comprehensive meta-analysis to synthesize the effectiveness of PjBL in EFL/ESL writing by examining 11 articles based on databases of Scopus and Google Scholar from 2013 to 2023. The result reveals that PjBL had a significant positive effect size in EFL/ESL writing. Moreover, the effect sizes of some moderating variables were analyzed, including educational levels, sample size, research design, intervention duration, and group size. It was found that the most important moderating variable that affects the effectiveness of PjBL in EFL/ESL writing is intervention duration. The significant overall effect of PjBL on ESL/EFL writing implies the need for educators to consider using PjBL in language teaching and learning. Meanwhile future researchers might consider applying other moderating variables such as research design, instructional strategies, and student characteristics, to identify the best practices for implementing PjBL in ESL/EFL writing.
Cahyono et al. (Thu,) studied this question.