“Proposal for Improving the Reliability, Validity, and Impartiality of the Performance Evaluation, and Its Classification by Means of the 9-Box System by Statistical Methodology”. Revista Guatemalteca de Psicología 1, no. 1 (April 11, 2025). Accessed April 24, 2026. https://revistasguatemala.usac.edu.gt/rgp/article/view/2443.