On May 23rd,2023, we held GNRC seminar. The lecture entitled “The theory and practices of mixed method study” was given by Dr. Denise M. Saint Arnault, Professor, Vice-chair of the Department of Health Behavior and Biological Sciences, School of Nursing, University of Michigan, and Dr. Laura Sinko, Assistant professor of the Temple University College of Public Health. 31 participants from Japan and other countries attended the lecture.