- Construct the network for the project. Fig. 15
The network is a delineation of the sequence in which the activities are to be performed.
Each activity is represented by a horizontal arrow, which may or may not be to scale. The
arrow representing a given activity is placed to the right of its immediate predecessor ac-
tivity. Where there are multiple predecessors or successors, broken arrows are used to
transfer from one activity to another. The duration of each activity is recorded under its
corresponding arrow.
Completion of an activity and the start of its successor constitute an event. Com-
mencement of a given activity is termed its i event; completion of an activity is termed its
j event. A number is assigned to each event and is recorded in the network in a circle be-
tween consecutive arrows. Each activity is identified by the events it separates. For in-
stance, 6-7 designates erect water tank. A chain of activities extending from inception to
completion of the project is termed a path. In this project there are the following five
paths:
0-1-2-3-4-5-8-13
0-1-2-3-6-7-8-13
0-1-2-3-9-11-12-13
Legend:
Late event time
Early event time
FIGURE 15. CPM network for site-preparation project.
Install overhead pole line
Pull in
power
feeder
Install
manholes
- Install
electrical
duct bank
Excavate for
electrical
manholes
Install sewer
and backfill
Excavate
for sewer
Rough
grade
Survey
and
lay out
Clear
site
Water-tank
foundations
Erect
water tank
Tank piping
and valvesi
Connect
piping
!Underground
water piping/
Install
Drill well well pump
