Development E-Portoqu: A Validated Digital Portfolio that Improves Vocational Teachers’ Performance

This study develops and validates ePortoqu, a digital portfolio for vocational teacher appraisal in Indonesia, using the ADDIE-based Research and Development (R&D) model. A quasi-experimental design was conducted across 10 vocational schools involving 120 teachers and 12 experts. Validation included content validity (Aiken’s V = 0.85–0.93), usability testing (SUS mean = 79.2; α = 0.91), and effectiveness evaluation through pre- and post-tests. Results showed significant improvement in teacher performance (Mpre = 72.4 vs. Mpost = 84.9; t(119) = 9.27, p < 0.001, d = 1.04), particularly in reflective practice (+15.2 points). Usage analytics indicated consistent artefact uploads (median = 15/teacher) and a rapid 48-hour feedback cycle. The study contributes by demonstrating tri-validation (content, usability, and effectiveness) of digital portfolios in vocational contexts and offering design principles for scalable teacher appraisal systems in developing countries. ePortoqu shifts appraisal from administrative routine to reflective, feedback-driven practice with implications for policy and AI-based integration in vocational education.