Automating Thematic Analysis With Multi-Agent LLM Systems

Abstract

Thematic analysis (TA) is a method used to identify, examine, and present themes within data. TA is often a manual, multistep, and time-intensive process requiring collaboration among multiple researchers. TA’s iterative subtasks, including coding data, identifying themes, and resolving inter-coder disagreements, are especially laborious for large data sets. Given recent advances in natural language processing, Large Language Models (LLMs) offer the potential for automation at scale. Recent literature has explored the automation of isolated steps of the TA process, tightly coupled with researcher involvement at each step. Research using such hybrid approaches has reported issues in LLM generations, such as hallucination, inconsistent output, and technical limitations (e.g., token limits). This paper proposes a multi-agent system, differing from previous systems using an orchestrator LLM agent that spins off multiple LLM sub-agents for each step of the TA process, mirroring all the steps previously done manually. In addition to more accurate analysis results, this iterative coding process based on agents is also expected to result in increased transparency of the process, as analytical stages are documented step-by-step. We study the extent to which such a system can perform a full TA without human supervision. Preliminary results indicate human-quality codes and themes based on alignment with human-derived codes. Nevertheless, we still observe differences in coding complexity and thematic depth. Despite these differences, the system provides critical insights on the path to TA automation while maintaining consistency, efficiency, and transparency in future qualitative data analysis, which our open-source datasets, coding results, and analysis enable. © 2025 for this paper by its authors.