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accountability for integration and to identify the
costs of integrating and testing components of a
Error 3: The WBS is inconsistent with the PBS.
This makes it possible that the PBS will not be
fully implemented, and generally complicates the
management process. Some examples of these errors are shown in
Figure 11. Each one prevents the WBS from
successfully performing its roles in project planning and
organizing. These errors are avoided by using the WBS
development techniques described above.
4.4 Scheduling Products described in the WBS are the result of
activities that take time to complete. An orderly and
efficient systems engineering process requires that
these activities take place in a way that respects the
underlying time precedence relationships among them.
This is accomplished by creating a network schedule,
which explicitly take s into account the dependencies of
each activity on other activities and receivables from
outside sources. This section discusses the role of
scheduling and the techniques for building a complete
4.4.1 Keeping track of schedule progress is an
essential part of controlling the project, because cost
and technical problems often show up first as schedule
problems. Because network schedules show how each
activity affects other activities, they are essential for
predicting the consequences of schedule slips or
accelerations of an activity on the entire project.
Network scheduling systems also help managers
accurately assess the impact of both technical and
resource changes on the cost and schedule of a project.
4.4.2 Network Schedule Data and Graphical
Network schedule data consist of: •
Dependencies between activities (e.g., where an
activity depends upon another activity for a
Products or milestones that occur as a result of
one or more activities
Duration of each activity. A work flow diagram (WFD) is a graphical
display of the first three data items above. A network
schedule contains all four data items. When creating a
network schedule, graphical formats of these data ar...
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