The purpose of this mixed-method study was to examine the perceptions of Arabic language student teachers towards the effectiveness of university supervisors, cooperating teachers, and school principals during their practicum teaching in the Kingdom of Saudi Arabia. To collect the data, the researcher employed survey and focus group interviews. The sample of the study consisted of 90 student teachers from Umm Al-Qura University. The findings of the study revealed that on average the majority of the student teachers (male and female) agree that the university supervisors have no effective roles during the teaching practicum. In addition, the results showed that the majority of the participants (male and female) agree that the cooperating teachers have effective roles during the teaching practicum. The findings also showed that on average the majority of the participants (male and female) agree that the school principals have effective roles during the teaching practicum. The results of the quantitative part found different perceptions among the participants based on their gender regarding the effectiveness of the university supervisors. The difference was to the side of the male student teachers. However, the findings of the qualitative part revealed that there were no different perceptions among participants according to their gender toward the effectiveness of the university supervisors. In addition, the results of the study showed that on average there was no difference in perceptions between female and male student teachers toward the effectiveness of the cooperating teacher and the school principals during the teaching practicum. Based on the results of this study, recommendations for practices and future research were presented. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]