1. A computer-readable medium carrying one or more sequences of instructions for determining a task to be performed by a participant, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of: receiving task data that indicates a plurality of tasks to be performed by a plurality of participants; receiving quorum data that indicates a particular participant set of one or more participants of the plurality of participants to participate in a particular task of the plurality of tasks; receiving personal interruptibility data that describes, for a participant among the particular participant set, a particular communications medium through which the participant can be interrupted while performing a current task set of one or more tasks that the participant is currently performing, wherein the particular task is not included in the current set; and determining a particular time interval to perform the particular task based at least in part on the personal interruptibility data.