Bar (Gantt) Charts - Construction Project Scheduling and Control - page 17

Figure 2.1 Bar chart for placing a simple slab on a grade
Excavate
Form Footings
Place Rebar
Place Concrete
Strip Forms
2 4 6 8 10 12 14 16 18 Days
Figure 2.2 Alternative bar chart for placing a simple slab on a grade placed in two parts
the as-built schedule (Figure 2.5). Using Oracle Primavera Project Manager (P6)
software, we can show activities with interruptions as continuous bars or as “necked”
bars (Figure 2.3).
Since bar charts basically use the x -axis only (to depict time), the y -axis is used
(in addition to showing individual activities) to represent a variable across time, such
as man-hours (Figure 2.4), budget (Figure 2.5), percent complete (Figure 2.6), and
so forth. This variable is usually shown as a curve superimposed on the bar chart. In
Figure 2.5, Scurves (also called lazy-S curves ) represent the percent on extrapolation
from the as-built curve.