Unformatted text preview: n event. An event is binary; that is, it has either occurred or it
has not. An activity, on the other hand, can be partially complete. Note that this is a special use of the word
event. We speak of a football game as an event, even though it spans time. In scheduling terminology,
however, an event is a specific point in time where something has just started or has just been finished.
The network in the top half of Figure 5-2 uses activity-on-node notation, in which the work is shown as a box
or node and the arrows show the sequence in which the work is performed. Events are not shown in
activity-on-node networks unless they are milestones—points in the project at which major portions of the
work are completed. Figure 5-2 Arrow charts.
Why two forms of diagrams? Probably a tyranny to confuse the initiate. Actually, it simply happens that the
schemes were developed by different practitioners.
Is one better than the other? No. They both get the same results in figuring out when work is supposed to be
completed. Both forms are still used, although activity-on-node is used a bit more than the other, because
much of today’s personal computer software is programmed to use node notation.
www.erpvn.net The main advantage of using CPM or PERT is that they allow you to predict if it is possible to meet an
important project completion date and when various tasks must be finished in order to meet that deadline.
Further, you can tell which tasks have some leeway and which do not. In fact, both CPM and PERT determine
the location of the critical path (the longest series of activities that can’t be done in parallel) and thus governs
how early the project can be completed.
The critical path is the longest path through a project network and determines the earliest date on which
work can be completed. All activities on the critical path must be completed as scheduled, or the end date
will begin to slip—one day for each day a critical activity is delayed. Previous Table of Contents Next Products | Contact Us | About Us | Privacy | Ad Info | Home
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EarthWeb is prohibited. Read EarthWeb's privacy statement. www.erpvn.net Fundamentals of Project Management
by James P. Lewis
ISBN: 0814478352 Pub Date: 01/01/95
Search Tips Search this book: Advanced Search Previous Table of Contents Next Title ----------- THE REASON FOR SCHEDULING
Naturally, the primary reason for scheduling a project is to ensure that an imposed deadline can be met.
Because the critical path method helps identify the activities that will determine the end date, it also offers
guidance on how the project should be managed.
It is easy to get carried away with scheduling and to spend all of your time updating, revising, and so on. The
scheduling software in use today should be viewe...
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