Unformatted text preview: printed them, so if the diagram shows this, it is wrong. There is no single right solution, but a
diagram can be said to be wrong if it violates logic.
The network for the yard project could get a lot more complicated. You could add edge front sidewalk and
edge back sidewalk. You could talk about trimming around trees in both front and back. And so on. But there
is no need to make it too complicated. We don’t usually try to capture exactly how we will do the work, just
the gist of it.
The next step is to figure out how long it will take to do the job. Time estimates for each task are made by
using history—remembering how long each activity has taken in the past. Remember, though, that the
estimate is valid only for the individual who is going to do the task. If my daughter, who is sixteen, does the
lawn mowing using a push mower, it will probably take less time than if my son, who is only twelve, tackles
the job. (In Chapter 6, we discuss how to find the critical path through the network, which helps you figure
out how long the project will take.)
It is hard to tell if a network is absolutely correct, but it can be said to be wrong if logic is violated. Figure 5-5 Work breakdown structure for room-cleaning project. EXERCISE
For the WBS in Figure 5-5, draw an arrow diagram. One solution is shown in the Appendix. Key Points to Remember
• Project management is not just scheduling.
• Arrow diagrams allow an easier assessment of the impact of a slip on a project than do Gantt charts.
• Schedule at a level of detail that can be managed.
• No task should be scheduled with a duration much greater than four to six weeks. Subdivide longer
tasks to achieve this objective. Previous Table of Contents Next www.erpvn.net 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 Chapter 6
Scheduling Computations ----------- Once a suitable network has been drawn, with durations assigned to all activities, it is necessary to determine
where the longest path is in the network and whether it will meet the target completion date. Since the longest
path through the project determines minimum project duration, if any activity on that path takes longer than
planned, the end date will slip accordingly. Because of its importance, this path is called the critical path.
The critical path is the longest path through a project network. It therefore determines the earliest
completion for the work.
Normally, you would let a computer do these computations for you, so you may wonder why it is necessary to
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