The ABC Model: Implementation and Outcomes Data

The ABC Model: Implementation and Outcomes Data This repository contains data and examination materials from a longitudinal quasi-experimental study evaluating the ABC (Autonomy-Belief-Competence) assessment model in undergraduate mathematics. THE ABC MODEL The ABC model is a novel choice-based assessment approach combining:- Tiered task selection: Examination tasks stratified across three difficulty levels (A/B/C)- Weighted grading: Differentiated point values (10/12/14 points) incentivizing challenge-seeking- Best-N selection: Students' three highest-scoring tasks counted toward final grade- Summative examination context: Applied within high-stakes final examinations Unlike existing approaches where choice is typically limited to formative contexts, ABC operationalizes autonomy support within summative evaluation while maintaining rigorous academic standards. STUDY OVERVIEW Study Period: 2023-2025Institution: Karakalpak State University, UzbekistanSample: 1,572 student-course observations from 261 unique studentsDesign: Within-subject comparison (Traditional vs ABC), longitudinal follow-up (2 years), scale-up evaluation. KEY FINDINGS - Pass rates increased: 45.6% → 91.5% (+45.9 percentage points)- Quality performance (grades 4+5): 27.4% → 60.8% (+33.4pp)- Retake rates declined by 83%: 54.4% → 8.5%- Effects sustained longitudinally into second-year courses- Inter-group performance variation reduced by 52% across language groups (Uzbek, Karakalpak, Russian) REPOSITORY CONTENTS 1. ABC_Analysis_1.xlsx — Complete performance dataset (11 sheets) • Course-level data: Years 1-3 (2023-2025) • Within-subject comparison (540 observations) • Longitudinal tracking (1,032 observations) • Language group stratification 2. ABC_Model_Exam_Samples.pdf — Examination materials (20 pages) • Traditional examination format (baseline): sample variant + grading criteria • ABC examination format: sample variant with tiered tasks (A/B/C levels) + complete grading system • Grade calculation examples demonstrating different student strategies • Approved by Faculty Council of Mathematics (2023-2024) DATA STRUCTURE Excel file contains 11 sheets:- Sheets 1-3: Course-level data by year- Sheets 4-8: Aggregated summaries and language group analyses- Sheets 9-11: Cohort-specific data (Primary, Scalability, Historical) Variables include: course, language group, semester, assessment system, student counts, pass/retake rates, grade distributions. ETHICS AND ANONYMIZATION Ethics approval: University Council, Karakalpak State UniversityAll student identities replaced with numeric identifiersData collected as part of routine educational assessment (2023-2025) RELATED PUBLICATION Manuscript under review. Citation details will be added upon acceptance. CONTACT For questions about data or implementation:Karakalpak State [e-mail]