Table 1: Comparison of floats in PMSs.

Software Used Float Types Definition for TF Definition for FF Key Difference Compared to Other PMSs
Microsoft® Office Project TF, FF, start float and finish float The amount of time an activity’s finish date can be delayed without delaying the project’s finish date The amount of time that an activity can be delayed without delaying any successor activity It defines the negative total float to display the amount of negative total float for an activity on the Gantt Chart
Oracle® Primavera® P6TM TF, FF, start float and finish float The amount of time the selected activity can be delayed without delaying the project’s finish date The amount of time the selected activity can be delayed without delaying the immediate successor activities It defines the float path to representing the path made of activities that drive the activity with the least TF/FF
Deltek® Open PlanTM TF, FF, finish total float, finish free float, relationship total float and relationship free float The difference between the early and late start dates
measured in working periods of the activity calendar
The maximum amount by which an activity can be
delayed beyond its early dates without delaying any successor activity beyond its
early dates
It defines the scheduled float to the difference between the late finish date and the scheduled finish date of the activity