以下の論文も、2年越しに掲載されることになりました、
Yamada, T., Fushimi, K., Saitoh, S., Higuchi, T. & Okada, M. (2021.6). Digital Badge as an e-Certificate of Informal Education Program: A Case Study at Open University of Japan. AAOU Annual Conference 2021 (2021/6/1-3, Online, Sri Lanka). Volume II: Full Papers of the 34th ANNUAL CONFERENCE OF THE ASIAN ASSOCIATION OF OPEN UNIVERSITIES (AAOU 2021), 347-358.