Float Trend Chart

Posted on April 29, 2010 by


“We’ve had to start some of these project activities a little later than we had hoped—how has our wiggle-room for starting these remaining activities changed?” Float (also called slack) is how much time a certain project activity’s start can be delayed without delaying the finish date of the entire project. Please see the earlier posting of “Float” for a more detailed description. Although the Float for all the project activities can be neatly calculated before the project begins, this Float can be expected to change. This happens as activities are actually started and completed. For example, an activity that finishes a day late robs the successive activities in its path of that day of Float. Whereas a later activity may have had a range of ten days during which it could start, now it only has a range of nine days. The less Float, the greater the risk of finishing the project past its deadline because there is less of a time cushion to use for unexpected delays. If these changes in Float over the time of the project are graphed, this graph is called a Float Trend Chart.