Project Management in the Oil and Gas Industry

Arrow diagram
A
B
C
D
E
F
Precedence diagram
Start
A
B
C
Finish
D
E
F
Figure 3.5 Tools to arrange the activities.

---

Pitfalls in Time Schedule Planning 97
network with the total durations shorter than the critical path is called a 
sub-critical or non-critical path.
3.5.5 Program Evaluation and Review Technique (PERT)
This is required in any case of special projects or large-scale deliveries 
with a variety of activities. All activities in the project need to be identified 
accurately and all must be completed before the project completion. These 
activities must be initiated and carried out in a specific sequence and must 
be completed before the start of the completion of other activities. Some 
activities may occur in parallel, meaning that two or more could be com-
pleted at the same time.
In addition, there are specific achievements that indicate the completion 
of key stages in the project. The successful management of such projects 
must be carefully planned during implementation of these projects to 
speed up the delivery during a specified period of time, to coordinate the 
multi-activity of the project and monitor the use of various resources nec-
essary for its implementation, and to achieve the project on time within 
the budget cost.
One of the operations research methods, which are used to assist the plan-
ning team, the coordination, the control of such projects special in case of the 
multiplicity and complexity of activities, and large size projects is known as 
the method of Program Evaluation and Review Technique known as PERT. 
Although the method of PERT is mainly used for military purposes, it 
has been used successfully since 1959 for most large-scale projects. PERT