Which Type of Chart Is Better?
Although a Gantt chart offers a valuable
snapshot view of the project, PERT
charts are more useful for scheduling,
monitoring, and controlling the actual
work. With a PERT chart, a project manager can convert task start and finish
times to actual dates by laying out the
entire project on a calendar. Then, on
any given day, the manager can compare
what should be happening with what is
taking place, and react accordingly. Also,
a PERT chart displays complex task patterns and relationships. This information
is valuable to a manager who is trying to
address high priority issues. PERT and
Gantt charts are not mutually exclusive
techniques, and project managers often
use both methods.
Figure 3-7 shows both chart types. The
top screen is a Gantt chart with 11 tasks.
The PERT chart in the bottom screen
shows the same project, using a separate
box for each task instead of a horizontal bar. Although they both show the task patterns and flow, the PERT chart boxes can provide more detailed information, such as task duration, start date, andfinish date. You
will learn how to create PERT charts in following sections.
Which Type of Chart Is Better?Although a Gantt chart offers a valuablesnapshot view of the project, PERTcharts are more useful for scheduling,monitoring, and controlling the actualwork. With a PERT chart, a project manager can convert task start and finishtimes to actual dates by laying out theentire project on a calendar. Then, onany given day, the manager can comparewhat should be happening with what istaking place, and react accordingly. Also,a PERT chart displays complex task patterns and relationships. This informationis valuable to a manager who is trying toaddress high priority issues. PERT andGantt charts are not mutually exclusivetechniques, and project managers oftenuse both methods.Figure 3-7 shows both chart types. Thetop screen is a Gantt chart with 11 tasks.The PERT chart in the bottom screenshows the same project, using a separatebox for each task instead of a horizontal bar. Although they both show the task patterns and flow, the PERT chart boxes can provide more detailed information, such as task duration, start date, andfinish date. Youwill learn how to create PERT charts in following sections.
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