Schewe, Klaus-DieterThalheim, BernhardKaschek, RolandFeltz, FernandOberweis, AndreasOtjacques, Benoît2019-10-112019-10-1120043-88579-385-7https://dl.gi.de/handle/20.500.12116/28539Group-oriented web information systems (GWISs) are web-based dataintensive systems that are used by a group of people in order to fulfill common tasks. In particular, there are different roles for the users, each associated with some rights and obligations. The group orientation implies that some of these obligations and rights depend on actions done by other roles. In this article a deontic logic for formulating and reasoning about such obligations and rights is presented.enText/Conference Paper1617-5468