Resource Allocation and Resource Leveling - Construction Project Scheduling and Control - page 133

Example 6.3

Let us consider a more complicated example, which is still far less complicated
than real projects, which have hundreds of activities and tens of resources.

Activity ID Activity Description Duration (Days) IPA Laborers

A Excavation & Foundation 6 - 4

B Slab on Grade (SOG) 3 A 3

C Framing 10 B 4

D Plumbing 4 B 2

C a

E Electrical Wiring 3 3

C a

F Drywall 5 3

HVAC b Rough-in C a

G 3 4

H Roof 5 C 3

I Paint 4 F 2

J HVAC Finish 2 G, H 2

K Flooring 4 D, I 3

L Electrical Finish 1 E, H 2

M Punch List & Cleanup 1 J, K, L 2

a This is a combination SS + FF relationship with no lags.
b HVAC is an acronym for heating, ventilation, and air-conditioning.

For each of the following scenarios, determine how to level the resources:

a. An unlimited number of laborers
b. Only 10 laborers available at any time
c. Only 8 laborers available at any time
d. Only 8 laborers available at any time, but activities may be interrupted
e. Only 8 laborers available at any time, but the labor resource may drive
the durations of activities

Solution

Figure 6.5 shows the precedence network solution for Example 6.3.

a. An unlimited number of laborers . As shown in Figure 6.6], the project
finishes in 28 days. Using the early dates results in a maximum labor
use of 14 laborers per day on days 17, 18, and 19.
b. Only 10 laborers available at any time . Only one adjustment is neces-
sary: Delay activity G by 3 days (it had 6 days of total float), as shown