Bayu Putra, R., Defit, S. and Fitri, H. 2021. EVALUATION OF THE QUALITY OF ONLINE LEARNING USING THE ROUGH SET METHOD IN THE COVID 19 ERA . Jurnal Ipteks Terapan. 15, 2 (Jun. 2021), 159–170. DOI:https://doi.org/10.22216/jit.v15i2.256.