Resource Allocation and Resource Leveling - Construction Project Scheduling and Control - page 131

Using the early dates, we note that on days 6 and 7, the subcontractor
needs seven laborers, one over the limit. The subcontractor then decides to
use 2 days of the float for activity C (Figure 6.3). This shift eliminates the
labor-use spike on days 6 and 7 and increases the use of laborers on days 9
and 10 from three to six.
Figure 6.2 (a) Bar chart for example 6.2 with an unleveled labor assignment (typically
following early dates); (b) resource, or labor, usage profile for example 6.2, showing
overallocation
The subcontractor observes that, even though he or she did not exceed
the limit on the number of laborers per day (six) in Figure 6.3, the labor usage
profile can be improved by minimizing the fluctuations, as shown in Figure 6.4.