Resource Allocation and Resource Leveling - Construction Project Scheduling and Control - page 134

in Figure 6.7. Another scenario is shown in Figure 6.8 with the peak
use pushed to days 23 (9 laborers) and 24 (10 laborers) by delaying
activities E by 3 days, G by 6 days, and J and L by one day each. We
can still meet the original finish date, 28 days, with no delay.

9, 13

D
4

23, 27

16, 19

19, 23

K
4

E
3

23, 27

23, 26

19, 23

27, 28

24, 25

I
4

L
1

M
1

0, 6
A
6

6, 9 14, 19

9, 19

19, 23

B
3

C
10

F
5

26, 27

27, 28

19, 24

24, 26

9, 19

14, 19

0, 6 6, 9

H
5

J
2

16, 19

25, 27

20, 25

G
3

22, 25

Figure 6.5 Logic network solution for Example 6.3

c. Only 8 laborers available at any time . In this case, the project must be
delayed by 1 day (Figure 6.8). This is an example of forward resource lev-
eling , in which resources are not available to both satisfy the demand
for all activities and finish on time. This situation is discussed at the
end of this example.
d. Only 8 laborers available at any time but allow activities to be interrupted .
Even with interruptible activities, we could not satisfy the activities'
need for resources and maintain the total resource daily usage within
8 laborers, yet finish in 28 days. We need 29 days (Figure 6.9). In
Figure 6.10, we managed to do it in 28 days with one minor violation
of the logic: we allowed activity K to start one day before the completion
of activity I.