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