Abstract
Making the first version of a schedule, planners usually count with normal crew sizes on normal work days, that is, they count with normal activity duration times. If the calculated project duration is beyond the deadline, then it has to be decreased. The planner has two possibilities to compress the project time span within the given boundaries. First, he or she can change the precedence relationships, make more activities partially or completely concurrent, or organize the resources more efficiently, which can result in deleting some precedence relationships. The second possibility is to shorten the activity durations, as much as needed for the schedule to meet the deadline. It would be a great help to know how much can the project duration be shortened, i.e., what the minimum project duration is. If the schedule according to the minimum project duration is still behind the desired schedule, then the only solution is to change the network logic.
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