IBM ILOG Scheduler User's Manual > Advanced Concepts > Scheduling with Unary Resources: the Bridge Problem > Solving the Problem > Choosing the Activity to Schedule First

Earliest and latest start or end times generally constitute appropriate data for deciding which activity to schedule first. The value IloSelFirstRCMinStartMax of the enumerated type IloResourceConstraintSelector indicates that the unranked resource constraint corresponding to the activity with the minimal earliest start time is to be selected. When two or more activities have the same earliest start time, the activity with the minimal latest start time is chosen.