Evaluating the Effectiveness of Formative Assessment in Secondary School Efl Classrooms: A Large-Scale Empirical Study in Uzbekistan

This study investigates the pedagogical impact and structural effectiveness of formative assessment (assessment for learning) mechanisms on secondary school English as a Foreign Language (EFL) learners' linguistic and communicative competencies. Drawing upon a rigorous quasi-experimental design, the research involved 323 tenth- and eleventh-grade students across six public schools situated in three distinct regions of Uzbekistan: Qashqadaryo, Jizzax, and Samarqand. Over a six-month experimental period, the control group ($N=160$) received conventional instruction primarily aligned with summative assessment metrics, while the experimental group ($N=163$) utilized a systematic formative assessment framework seamlessly integrated into the current "Prepare" national textbook series. The formative framework comprised digital assessment applications (Kahoot!, Padlet, Flip), descriptive teacher feedback, electronic portfolios (E-portfolios), and structured student self- and peer-assessment rubrics. Data gathered through standardized CEFR-aligned pre- and post-tests indicated statistically significant improvements in the experimental group's productive language skills (Speaking and Writing). Quantitative analysis revealed a net mean proficiency gain of +18.6 points in the experimental group compared to a nominal +4.3 points in the control group. Qualitative reflection highlights that formative assessment minimizes assessment anxiety and cultivates metacognitive awareness among EFL learners. The paper concludes with critical policy recommendations for curriculum alignment, materials development, and professional teacher development in developing educational contexts.