Once your project is under way and you start entering actual data, you should ordinarily calculate with actual dates.
When Calculate Using Actual is on, MacProject II uses the schedule’s actual dates to determine late dates, critical path, slack times, and resource durations.
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Choose Calculate Using Actual from the Dates menu.
For calculating late dates with actual dates, MacProject II assigns the last task’s Actual Finish to be its Latest Finish and takes a backward pass through the schedule to determine the rest of the late dates.