SEFL: A Framework for Generating Synthetic Educational Assignment Feedback with LLM Agents

Mike Zhang, Amalie Pernille Dilling, Léon Gondelman, Niels Erik Ruan Lyngdorf, Euan D. Lindsay, Johannes Bjerva


Abstract
Providing high-quality feedback on student assignments is crucial for student success, but it is heavily limited by time and budgetary constraints. In this work, we introduce Synthetic Educational Feedback Loops (SEFL), a synthetic data framework designed to generate data that resembles immediate, on-demand feedback at scale without relying on extensive, real-world student assignments and teacher feedback. To obtain this type of data, two large language models (LLMs) operate in a teacher-student role to simulate assignment completion and formative feedback, generating 19.8K synthetic pairs of student work and corresponding critiques and actionable improvements from a teacher. With this data, we fine-tune smaller, more computationally efficient LLMs on these synthetic pairs, enabling them to replicate key features of high-quality, goal-oriented feedback. Through comprehensive evaluations with three LLM judges and three human experts, across a subset of 900 outputs, we demonstrate that SEFL-tuned models outperform both their untuned counterparts and an existing baseline in terms of feedback quality. The potential for societal impact is reinforced by extensive qualitative comments and ratings from human stakeholders — both students and higher education instructors. SEFL has the potential to transform feedback processes for higher education and beyond.
Anthology ID:
2026.lrec-1.811
Volume:
Proceedings of the Fifteenth Language Resources and Evaluation Conference
Month:
May
Year:
2026
Address:
Palma de Mallorca, Spain
Editors:
Stelios Piperidis, Núria Bel, Henk van den Heuvel, Nancy Ide, Simon Krek, Antonio Toral
Venue:
LREC
SIG:
Publisher:
ELRA Language Resource Association
Note:
Pages:
10324–10340
Language:
External URL:
https://lrec.elra.info/lrec2026-main-811
DOI:
10.63317/3gqx9z5n3zsu
Bibkey:
Cite (ACL):
Mike Zhang, Amalie Pernille Dilling, Léon Gondelman, Niels Erik Ruan Lyngdorf, Euan D. Lindsay, and Johannes Bjerva. 2026. SEFL: A Framework for Generating Synthetic Educational Assignment Feedback with LLM Agents. In Proceedings of the Fifteenth Language Resources and Evaluation Conference, pages 10324–10340, Palma de Mallorca, Spain. ELRA Language Resource Association.
Cite (Informal):
SEFL: A Framework for Generating Synthetic Educational Assignment Feedback with LLM Agents (Zhang et al., LREC 2026)
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