Ismahane Haridi, Messaoud Aiche, Abdeldjalil Hamdaoui and Ahmed Mounir Ansar 2025. THE USE OF DIRECT OBSERVATION TO EVALUATE THE DEGREE OF VISUAL COMFORT IN THE LIBRARY OF GUELMA UNIVERSITY. International Journal of Innovative Technologies in Social Science. 4(44) (Jan. 2025). DOI:https://doi.org/10.31435/ijitss.4(44).2024.3089.