Addressing Global Challenges and Quality Education: 15th European Conference on Technology Enhanced Learning, EC-TEL 2020, Heidelberg, Germany, September 14–18, 2020, Proceedings - Alario-Hoyos; Arnedillo-Sánchez, Inmaculada; Dennerlein, Sebastian Maximilian; Rodríguez-Triana, María Jesús; Scheffel, Maren (Springer International Publishing, 2020)