Mario Piattini, Paulo Rupino da Cunha, Ignacio García Rodríguez de Guzmán, Ricardo Pérez-Castillo: Quality of Information and Communications Technology - 12th International Conference, QUATIC 2019, Ciudad Real, Spain, September 11-13, 2019, Proceedings. Communications in Computer and Information Science 1010, Springer 2019, ISBN 978-3-030-29237-9