Pedagogical Content Knowledge in Action: A Comparative Study of Clustering within Blended and Flipped Writing Classrooms

This quasi-experimental study investigated the effect of integrating clustering pre-writing technique within blended and flipped instructional models on the writing performance of Iranian EFL learners. Framed by Pedagogical Content Knowledge (PCK) and cognitive process theory, the research aimed to determine how the interaction between a specific writing strategy and an instructional modality influence learning outcome. One hundred twenty intermediate-level learners were assigned to four groups: one using clustering in a blended model, one using clustering in a flipped model, and two control groups using traditional instruction in each model respectively. The intervention spanned ten sessions, with writing performance measured via pre- and post-tests using Jacobs et al.'s (1981) scale. Results revealed that both clustering groups significantly outperformed their control counterparts. Crucially, the Blended/Clustering group demonstrated superior improvement compared to the Flipped/Clustering group. The findings underscore that the efficacy of a writing technique is contingent upon the instructional context. It is concluded that a blended learning model provides the optimal synergy of structure, flexibility, and scaffolded interaction for techniques like clustering to flourish, offering a powerful PCK framework for EFL writing instruction.