Learning and Collaboration Technologies. Designing Learning Experiences 6th International Conference, LCT 2019, Held as Part of the 21st HCI International Conference, HCII 2019, Orlando, FL, USA, July 26-31, 2019, Proceedings, Part I - Zaphiris, Panayiotis; Zaphiris, Panayiotis; Ioannou, Andri; Ioannou, Andri (Springer International Publishing : Imprint: Springer, 2019)