Recommended citation:Soares, F. M., Saraiva, A. M., Pires, L. F., Drucker, D. P., Braghetto, K. R., Santos, L. O. B. D. S., Moreira, D. D. A., Corrêa, F. E., & Delbem, A. C. B. (2025). A novel ux-based approach for ontology evaluation: Applying tree testing to the agricultural product types ontology. IEEE Access, 13, https://doi.org/10.1109/ACCESS.2025.3595447In evaluating the APTO ontology, we selected tree testing as the primary UX measuring protocol. We believe tree testing is particularly suitable for ontology evaluation as it combines various metrics, such as time on task and task success, to assess how users navigate and understand a hierarchy of concepts. This method allows us to trace user paths through the ontology's structure, identifying which aspects of the modeling may be confusing or inaccurate from the user's perspective. By analyzing these user interactions, we can gain valuable insights into how the ontology's design impacts usability, ultimately guiding improvements to better align with user needs.Update in this version: images of pietrees.