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We extend time/utility functions and utility accrual model with the concept of joint utility functions (or JUFs) that allow an activity's utility to be described as a function of the completion times of other activities and their progress. We also specify the concept of progressive utility that generalizes the previously studied imprecise computational model, by describing an activity's utility as a function of its progress. Given such an extended utility accrual model, we consider thedoi:10.1109/isorc.2004.1300393 dblp:conf/isorc/WuRJ04 fatcat:nfljjirrbbg3rltdv5lle3auue