Civil Engineering Reference
In-Depth Information
Data Date
A
B
C
0
4
8
Figure 7.16 Workday unit percent complete
takes 4 days. Activity A is the predecessor to both B and C. Now, 4 days after
the project has started, activity A is complete and activities B and C have not
started yet (see Figure 7.16). In this case, each activity has a weight of 4 units.
The project has a total of 12 units. Actual (or completed) units are 4.
Percent complete = Actual Units∕Total Units = 4∕12 = 33%
Activity
IPA
Original Duration
Actual Duration
Remaining Duration
A
—
7
7
0
B
A
12
9
3
C
A
6
4
2
D
B, C
5
0
5
E
D
9
0
9
Total
39
20
19
This method is used in software scheduling programs such as Oracle Primavera
P6. Another example is the project shown in the table.According to this method,
the percent complete for this project is 20∕39, or 51.3%. Two simplifying—but not
necessarily realistic—assumptions underlie this method:
1.
All activities have the same “weight per day.”
2.
Weight within the activity is distributed linearly. Some programs give the user
the ability to change this assumption by dividing the activity into “steps” with
different weights (similar to the weighted or equivalent units method). This
division does not change the first assumption, that activities have weight pro-
portional to their duration.
This method is simple and can be used by contractors who do not cost-load
or resource-load their schedules. It has also an advantage that lags do not count
in the percent complete because this method is based on “work-unit” and not just
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