Page 255 - DCOM303_DMGT504_OPERATION_RESEARCH

Operations Research

Notes  It is more of an event-oriented technique rather than start- and completion-oriented, and
is used more in projects where time, rather than cost, is the major factor.

 It is applied to very large-scale, one-time, complex, non-routine infrastructure and Research
and Development projects.
 Program Evaluation and Review Technique (PERT) takes the CPM network and adds
distributions to represent the activity times of the project.

12.6 Keywords

Controlling: The process of analyzing and evaluating the actual progress against the plan.
Float: The amount of time available by which it is possible to delay its completion time without
extending the overall project completion time.
Planning: Process of creating and maintaining a plan.
Scheduling: The process of deciding how to commit resources between the varieties of possible
tasks.
Slack: The amount of time that a task in a project network can be delayed without causing a
delay to subsequent tasks and project completion date.

12.7 Review Questions

1. Prepare a network diagram for constructing a 5 floor apartment. The major activities of
the project are given as follows:

Activity Description Immediate Predecessor
A Selection of site -
B Preparation of drawings -
C Arranging the for finance A
D Selection of contractor A
E Getting approval from Govt A
F Laying the foundation E
G Start construction D, F
H Advertise in newspaper B, C
I Allocation of tenants G, H

2. For the problem No. 1 the time estimates in days are given. Determine the Time earliest
and Time latest, and the critical activities
Activity A B C D E F G H I
Time 3 5 7 2 5 20 60 2 10
(days)

3. An assembly having the following sequence of activities given along with their predecessor
in the table below. Draw a network diagram for the assembly.

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