This study explored determinants of support degrees of integrated education after administrating a
debate-centered instruction in a special education class. A total of 19 preliminary teachers were involved in
a debate-centered class based on a revised version of Johnson & Johnson’s debate model. Participants took
a mandatory part in an integrated education supporter position once and the counter position the other
time, a total of twice for debating given the topic, which was held six times in total over the semester.
The participants responded to a survey asking support degrees of integrated education, the most reliable
discussant, the most impressive discussant, and referring materials they used for the debates at the end of
each debate session. In addition, their epistemic beliefs were asked at the first and the end of the
semester. The results indicated no significant changes occurred between the beginning and the end of the
semester regarding students’ support degrees of integrated education and their epistemic beliefs on special
education. The most significant determinants of students’ support degrees of integrated education was their
own supporting position at the debating session. However, the debating position of the reliable discussants
and the impressive discussants was not significant degerminant of students’ support degrees of integrated
education. The most frequently used materials for the students to prepare for debates was academic
articles, and the variability of materials of use became greater over the course of the semester.