End-User Development 7th International Symposium, IS-EUD 2019, Hatfield, UK, July 10-12, 2019, Proceedings - Malizia, Alessio; Malizia, Alessio; Valtolina, Stefano; Valtolina, Stefano; Morch, Anders; Morch, Anders; Serrano, Alan; Serrano, Alan; Stratton, Andrew; Stratton, Andrew (Springer International Publishing : Imprint: Springer, 2019)