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Most solution concepts in collective decision making are defined assuming complete knowledge of individuals' preferences and of the mechanism used for aggregating them. This is often unpractical or unrealistic. Under incomplete knowledge, a solution advocated by many consists in quanrtifying over all completions of the incomplete preference profile (or all instantiations of the incompletely specified mechanism). Voting rules can be 'modalized' this way (leading to the notions of possible anddoi:10.24963/ijcai.2020/671 dblp:conf/ijcai/PortelasCWHO20 fatcat:nqkxitg6yzbzvor2c3bi6rib5q