Glossary - Construction Project Scheduling and Control - page 480

General Overhead —See Indirect Cost .
Graphical Evaluation and Review Technique (GERT) —A network analysis
technique that allows for conditional and probabilistic treatment of logical
relationships (i.e., some activities may not be performed).
Hub —An activity or milestone in logic networks, with numerous predecessors
and/or successors.
I-J Method —See Activity on Arrow (AOA) Network .
Impact Schedule —A schedule similar to the original (usually As-Planned ) schedule
but incorporating the causative factors (factors allegedly causing the schedule
delays). By comparing the two schedules (original and impact), the contractor
hopes to prove that the delay was caused by the alleged factors.
Imposed Finish Date —The project's completion date, as specified in the contract
or stipulated by the owner.
Independent Float (Ind. F) —The maximum amount of time an activity can be
delayed without delaying the early start of the succeeding activity(ies) and
without being affected by the allowable delay of the preceding activities.
Indirect Cost —An expense that cannot be directly associated with a specific activity
or work item, such as overhead, profit, or insurance. If the expense can be
attributed to a specific project, then it is part of job overhead; otherwise, it is
part of general overhead.
Interfering Float (Int. F) —The maximum amount of time an activity can be
delayed from its e arly start without delaying the entire project but causing delay
to the e arly start of the succeeding activity(ies). It represents the part of the
total float that remains after deducting free float. Mathematically speaking,
Int

F = TF − FF.
Interruptible Activity —An activity that can be performed in two or more separate
segments. It is an activity that can be interrupted or paused.
Inventory Buffer —A theory in materials management that calls for all materials to
be purchased, delivered, and stored on-site prior to installation.
Job Overhead —See Indirect Cost .
Just in Time —A theory in materials management that calls for delivering materials
at the time of installation only. Thus, materials are not stored on-site.
Lag —A minimum waiting period between the finish (or start) of an activity and the
start (or finish) of its successor.
Lane Rental Bidding/Contracting Method —The lane rental contracting method
is an innovative contracting technique by which a contractor is charged a fee for
occupying lanes or shoulders to do the work. Under this system, the owner
(usually the public agency) assigns an hourly or daily charge for closing a lane or
shoulder and charges the contractor for the closure. The objective of the
method is to motivate contractors to minimize closures on high-volume
roadways and/or during high-volume time periods. This method is similar to
the A + B Bidding/Contracting Method .
Late Dates (for an activity) —The Late Start date and Late Finish date of that
activity.

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