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 b. Adjustments. The Work Center Schedule Board is primarily a visual
communications means - for all levels of management and craftsmen - to inform
them as accurately as possible where that Work Center has been, is, and will
be working each day of the week. While scheduled daily assignments are
adjusted as required during the week, the weekly assignment (column 4 of
NAVFAC Form 9-11014/27) on Specific Job Orders should not be adjusted by the
Work Center Supervisor. If a Work Center has overexpended or underexpended
its assigned man-hours on Master Scheduled jobs, the total hours behind or
ahead must be shown in column 5 of Form NAVFAC 9-11014/27. The Work Center
Supervisor, or designee, must then determine how to make up this difference.
These decisions will be based upon discussions with the appropriate Branch
Manager, held at the first indications that the flexibility provided by Minors
will not permit the schedule to be achieved and that possibly other Work
Center tasks will be affected. It is possible that a major revision in the
Work Center schedule or even the Master Schedule will be required.
11. CRITICAL PATH SCHEDULING. Critical path scheduling is finding the
shortest time and/or the most efficient time it will take to complete a job.
See Appendix A.
a. USE. In some instances, overtime on a certain phase may reduce
overall jobcosts. Also, critical path scheduling permits evaluation of
overtime costs in relation to the full benefits to be derived. It may be
decided to extend the completion date rather than to authorize the overtime.
In short, critical path scheduling provides all the information required to
make rational decisions as to time and cost. As an optional method, for use
at the direction of the Public Works Officer, it can be effectively used for
repair or alteration of jobs normally accomplished by Public Works forces.
Generally, only multicraft jobs costing $5,000 or more should be considered
for this method. With only superficial examination, critical path scheduling
may appear to be a complex operation; however, the average Master Scheduler
can become proficient in its use with a little study and practice. Although
this technique might not be used very often, the principles apply to all types
of scheduling. Therefore personnel executing the scheduling function should
become familiar with the technique.
b. ADVANTAGES. A critical path schedule takes more time to develop than
an ordinary schedule, but this extra effort is offset by the following
advantages:
(1) A much more reliable and inclusive schedule is developed than
that produced by the ordinary scheduling process. The critical path method
allows selection of the best schedule under any given set of conditions.
(2) Costly and embarrassing mistakes, such as failing to consider
the effect of material delivery on the-job, are less likely to occur; and the
possibility of omitting small, but important, job operations is reduced to a
minimum.
(3) The entire job is shown in the form of a visible layout diagram
for management decisions. Each part or step of the job is represented by an
arrow in a diagram, and each part is thoroughly examined to assure its true
relation to all other parts.
9-15
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