Human-Computer Interaction - INTERACT 2019 17th IFIP TC 13 International Conference, Paphos, Cyprus, September 2-6, 2019, Proceedings, Part IV - Lamas, David; Lamas, David; Loizides, Fernando; Loizides, Fernando; Nacke, Lennart; Nacke, Lennart; Petrie, Helen; Petrie, Helen; Winckler, Marco; Winckler, Marco; Zaphiris, Panayiotis; Zaphiris, Panayiotis (Springer International Publishing : Imprint: Springer, 2019)