Precedence Networks - Construction Project Scheduling and Control - page 97

Figure 5.8 Percent complete approach: (a) activity B starts after activity A is at least 50%
complete; (b) final 30% of activity B progresses only after A is complete; (d) Figure 5.8a with
lags; (e) Figure 5.8b with lags; (f) activity B split
contiguous. In this case, early dates for B are (1, 7). (Contiguous and interruptible
activities are discussed later in this chapter.)
Another way we can redraw the relationship shown in Figure 5.8b is by splitting
activity B. This redrawing is shown in Figure 5.8e.
Tip Box 5.1
In many situations where you see two activities connected with a Finish-to-Start rela-
tionship, take another look: does the predecessor really need to be completed before
the successor can start.
FAST-TRACK PROJECTS
The term fast-track in the construction world means starting the construction
process while the design is still under development. Under normal circumstances
(i.e., the traditional way), the design must be complete before construction can start,
see Figures 5.9a. In some situations, time may be tight that the owner or project