“…A sizable number of studies of whose native language is English investigated the effectiveness of differentiated instruction on students' learning like Aftab, 2015;Ashton, 2018;Dixon, Yessel, McConnell & Hardin, 2014;Kotob & Abadi, 2019;Pentimoti, Justice, Yeomans-Maldonado, McGinty, Slocum & O'connell, 2017;Stavrou and Koutselini, 2016;Suprayogi, Valcke, & Godwin, 2017. However, few investigated the effect of differentiated instruction on Jordanian context like Magableh & Abdullah, 2019;Magableh & Abdullah, 2020;Siam & Al-Natour, 2016). Dixon, Yessel, McConnell and Hardin (2014) investigated the relationship between modified instruction in one side and professional development and teachers' efficacy in the other side.…”