Materi Kuliah Ke 9.

Network Scheduling :
Precedence Diagram
Method

• In AOA and precedence
diagramming, the activities are
represented by nodes rather than
arrows.

PDM Logical Relationship
• The left side of the PDM node is designed the
“start side” and the right side is designed the
“finished side”.
• Because of the importance of the side, PDM uses
arrowheads to identify the direction of
relationship.
• Precedence diagramming allows more flexibility
in modeling relationship than AOA diagramming.
AOA diagramming allow only one kind of logical
relationship : a preceding activity must be
complete before any succeeding activity can

begin.
• The four logical relationship used by PDM are :
Finish to start, Start to start, Finish to finish, Start
to finish

FS Relationship
• The most common precedence
diagramming relationship.
• The succeeding activity cannot start until
he preceding activity has been completed.
• FS relationship can be expressed in three
forms if lag is used, zero lag, positive and
negative lag.

SS Relationship