Basic Networks - Construction Project Scheduling and Control - page 36

Incorrect Correct

Figure 3.18 Node connection in node networks

B A B

A

A

Improper

B

A

B

Proper

Figure 3.19 Node order in node networks

can be horizontal, inclined, or broken; however, they should be positioned, in
general, from left to right. Try to avoid the situation shown in Figure 3.19.
4. Do not combine relationship lines (see Figure 3.20). These relationships are
independent from their start to their end. Besides, one of them may carry a lag
while the other one may not (or may carry a different lag).
5. Try to minimize line crossings (see Figure 3.21). When two lines (relation-
ships) must intersect, make a “jump” on one of them to indicate that they do
not intersect or meet.
6. Start the network with one node and finish it with one node. If the network
starts with only one activity (such as those in Figures 3.11 and 3.12), then
there is no need for an additional node. If it does not start with only one activity
(such as those in Figures 3.13), then insert a PS (Project Start) milestone node
at the start and tie it to those activities that start the network, as shown in

Figure 3.20 Relationship lines in node networks