Gajosta, E.E. et al. 2026. Challenges of Flexible Learning to Trainers and Trainees in Diploma Programs: Basis for Enhanced Learning Management System (LMS). International Journal of Sustainable and Integrated Studies. 1, 2 (Sep. 2026), 459–473. DOI:https://doi.org/10.65339/ijsis.V1.I2.103.