_1704001377 20231231091257000 Rovedar Daryoushbabazadeh@gmail.com Rovedar Journal of Contemporary Language Research J. Contemp. Lang. Res. 2980-8065 12 24 2023 2 4 Aakash Kumar https://orcid.org/0000-0002-4070-7559 William Rupley https://orcid.org/0000-0002-0994-0344 Debra McKeown https://orcid.org/0000-0003-3686-6925 Hassan Seyed https://orcid.org/0000-0003-2114-2473 David Paige https://orcid.org/0000-0003-2208-6784 Introduction: Dynamic assessment has demonstrated effectiveness in enhancing writing skills among ESL learners and may be especially useful in the improvement of writing mechanics by enabling individualized mediation and adaptive instruction. The major objectives of the current study were to examine the effectiveness of dynamic assessment in reducing writing mechanics errors among Pakistani learners in their essay drafts. The study also explored how experimental group students perceive the mediational intervention and dynamic assessment as an alternative approach to static assessment in improving writing mechanics. Methodology:  To perform the study, a sequential explanatory design was used to explore the effect of dynamic assessment instruction on Pakistani ESL learners’ writing mechanics. The sequential explanatory design allowed us to understand the phenomenon under study more comprehensively by collecting both quantitative and qualitative data in sequence. The quantitative part of the study used an interventionist model, with a pretest-treatment-posttest design, while the qualitative part used semi-structured interviews. Following a quantitative test of the efficacy of treatment, the researchers interviewed the participants of the experimental group to investigate their perceptions of the mediation approach. The interviews were recorded, transcribed, and analyzed for recurring themes and sub-themes. Results: The quantitative findings of this study confirmed the significant impact of dynamic assessment and were consistent with previous research reporting it as an effective approach to improving writing skills. Regarding the qualitative findings, dynamic assessment positively affected students’ writing mechanics. Students reported that dynamic assessment could reduce writing anxiety, enhance self-efficacy, and provide ample opportunities to learn from their errors. 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