The study aims to investigate the perceptions of teachers, school counselors and school administrators' perceptions of the factors affecting the success of inclusive practices. The data were collected from teachers, school counselors and administrative staff working in state-funded schools in Eastern Turkey through snowball sampling. A Demographics Form and The Factors Effecting the Success of Inclusive Practices Scale were used to collect data. A total of 246 educators (13 school administrators, 218 teachers and 15 school counselors) participated in the study. The results of the study revealed that the most important factors for teachers were the physical environment, students with normal development and their parents, whereas the least important factors were teachers themselves, school counselors and school administrators. The most important factors for school administration were non-governmental organizations, students with normal development, and physical environment whereas the least important factors were school administrators themselves, school counselors, and the Counseling and Research Center. The most important factors for school counselors were students with normal development, physical environment, and their parents whereas the least important factors were school counselors themselves, the Counseling and Research Center, and laws. The perceptions of all groups were differed by educational level but not gender and having a special student in their classrooms.