Civil Engineering Reference
In-Depth Information
her planned dates. Conservative thinking leans more toward early dates (especially for
the contractor). The owner's financial considerations may lean toward late dates. The
contractor may have other considerations for choosing planned dates, such as resource
availability and cost, resource leveling (explained in Chapter 6), other ongoing or
potential projects, and so forth.
Project Schedule “Health Check”
Some software programs, authors, and user agencies use certain metrics to check the
integrity and validity of the project schedule. The title “Health Check” is relatively
common for such check. Some of these metrics are:
a.
Missing predecessors
b.
Missing successors
c.
Redundant relationships
d.
Inaccurate lags
e.
Dangling activities
f.
Number of constraints
g.
Missing status
h.
Out of sequence activities
i.
Excessive float
The most famous check is the “DCMA 14,” which is a check developed by the
U.S. Defense Contract Management Agency (DCMA), which is responsible for over-
seeing federal acquisition programs. It contains a 14-point assessment check protocol
to be used for CPM schedule reviews made by their department. DCMA 14-Point
Schedule Assessment.
8
This check has been adopted by several organizations and soft-
ware programs. In general, it is a good idea to develop or have a list of checks for the
validity and integrity of the CPM schedule.
Event Times in Arrow Networks
Event times in arrow networks are calculated in the following manner:
•
The early event time,
T
E
, is the largest (latest) date obtained to reach an event
(going from start to finish).
•
The late event time,
T
L
, is the smallest (earliest) date obtained to reach an event
(going from finish to start).
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