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PERT
and CPM are planning and control tools for
defining the parts of a project and putting
them together in a network form so that the
person responsible for each element of work
knows what is supposed to happen and when
in relation to other project activities. The
basic difference in PERT and CPM methods is
the reliability of the estimate of the duration
of each activity. PERT is used when durations
are based on stochiastic (probabilistic) data.
CPM, on the other hand, is utilized when durations
are known or can be reasonable estimated.
In most applications, CPM is utilized, although
PERT is often used in government-sponsored
projects.
The CPM schedule example shows the dependencies
of one task on another in a Gantt (bar) chart
format. Another type of presentation is a
network (flow chart) diagram. Because the
latter becomes increasingly difficult to understand
as the number of tasks increases, Gantt charts
are more commonly utilized.
A Gantt Chart is a horizontal bar type chart
developed as a production control tool by
Henry Gantt. A Gantt Chart, today, provides
a graphical illustration of time related logic
and scope. |
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