Civil Engineering Reference
In-Depth Information
Tip Box 7.4
Having a “project update policy” is a must. Implementation and policing is also a must.
Retained Logic or Progress Override
As explained previously, project managers often overuse the finish-to-start (FS) rela-
tionship. In many practical cases, an FS relationship is assigned between two activities,
A and B, such that activity B cannot start until activity A is completed. In reality,
when work starts, activity B starts shortly after activity A has started and prior to its
completion. This situation violates the network logic. In the “execution report” of
Oracle Primavera P6 or other programs, such a violation is reported (more as a warn-
ing than as an error). However, the question the user faces is: “Will the remainder of
activity B depend on the completion of activity A, or is the FS relationship no longer
required?” For example, look at activities A and B in Figure 7.3a. Suppose that 6 days
0 , 10
10, 18
A
10
B
8
(a)
6, 10
10, 16
A
4
B
6
(b)
6, 10
A
4
6, 12
B
6
(c)
6, 10
7, 15
A
4
B
8
(d)
Figure 7.3 (a) Activities A and B of a project; (b) retained logic after 6 days' work;
(c) progress override after 6 days' work; (d) actual dates after 6 days' work
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