Identifying design principles for proactive services through systematically understanding the reactivity-proactivity spectrumErlenheim, Regina; Draheim, Dirk; Taveter, KuldarProceedings of the 13th International Conference on Theory and Practice of Electronic Governance : ICEGOV 2020, 23-25 September, 2020 : Online Conference2020 / p. 452–458 https://doi.org/10.1145/3428502.3428572 Conference Proceedings at Scopus Article at Scopus