The research project Classifications of Disabilities in the Field of Education (CLASDISA) investigates which environmental factors facilitate or restrict activity and participation of 8-to 12-year-old children with disabilities4 in the field of education in different societal and cultural contexts. The following report about this international research project provides insights into the research design, the first phase of field research, and the projects’ current progress with an emphasis on research activities in Thailand. Given that previous research pertaining to education and disability in Thailand has been rather unsystematic and fragmentary, particularly qualitative research (Cheausuwantavee, Nookaew, & Cheausuwantavee, 2010), this study aims