Determination of the Floats. Floats are the slack times available within the allotted
span of the noncritical activity. The most common are the total float and the free float.
Figure 6.46 gives a convenient summary for computing the total float (Tfij) and
the free float (FFij) for an activity (i, j). The total float is the excess of the time span
defmed from the earliest occurrence of event i to the latest occurrence of event j over
the duration of (i, j)-that is,