Total Float Consumption (TFC) generally applies to Projects that have a fixed end date. For these Projects, consumption of Total Float (TF) is a real commodity that should be monitored just as zealously as the Critical Path. Most Project Specifications classify TF as a “shared resource”.
However, if the TF of an early activity is consumed, the TF values of its successor activities can be consumed accordingly. This effect can result in placing a disproportionate burden upon other later activities along a common TF path. In addition, TFC can also increase the risk of completing the Project on time.
In the illustration below, the overall Project is completing “On Schedule”. However, activity “PR1150 – Roadway Design 90% – Prepare & Submit” is completing later when compared to the baseline schedule causing its TF value to decrease from 35 to 25 days.
This causes a cascading effect where other activities along the same TF path have decreasing TF values as well. For Example, activity “PR1100 – Area Roadway Construction” which happens to be the last activity along the same TF path experiences an equal reduction in TF value.
Zümmer’s Comparison Report, shown below, “Total Float Consumption” calculates the Gross TF between the Control and Modified selected Projects. In addition, the net Gained/Loss Gross TF is calculated along with the Gained/Loss TF Percentage.
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