This study examined the effectiveness of training EFL teachers in Palestine. Participants in the 12-weeks training program were 30 EFL teachers. In addition to surveys, and interviews, the study employed a mixed-method design. As a result of the training program, teachers' knowledge and skills significantly improved. A high degree of satisfaction was reported by the participants, who indicated that the training program had a positive impact on their teaching practices. A similar training program for EFL teachers should be implemented in Palestine, according to the study, which emphasizes the importance of providing teachers with opportunities to continue their professional development.