Khattapan, C.N. 2022. THE CASE STUDY RESEARCH OF EXAMINING THE USEFULNESS AND PERCEPTION OF THE ONLINE TEACHING PREPARATION PROGRAM: Received: 13th November 2021; Revised: 17th May 2022, 21st May 2022, 24th May 2022; Accepted: 24th May 2022. PUPIL: International Journal of Teaching, Education and Learning. 6, 1 (May 2022), 359–372. DOI:https://doi.org/10.20319/pijtel.2022.61.359372.