Artificial Intelligence in Education 20th International Conference, AIED 2019, Chicago, IL, USA, June 25-29, 2019, Proceedings, Part I - Isotani, Seiji; Isotani, Seiji; Millán, Eva; Millán, Eva; Ogan, Amy; Ogan, Amy; Hastings, Peter; Hastings, Peter; McLaren, Bruce; McLaren, Bruce; Luckin, Rose; Luckin, Rose (Springer International Publishing : Imprint: Springer, 2019)