Korhonen, A.-M., Donaldson, L. and Kunnari, I. 2022. Teacher Professional Development in Education 4.0: The Role of ePortfolios and Open Badges. Journal of Technical Education Science. 17, 3 (Jun. 2022), 13–24. DOI:https://doi.org/10.54644/jte.70A.2022.1221.