Glossary - Construction Project Scheduling and Control - page 492

the project can be divided into similar types of work, such as road construction
or earthmoving projects.
Unrestricted Float (in Precedence Networks) —The amount of time we can delay
all or part of an activity from its early start without delaying the entire project.
Updated Impact Schedule —A method developed by the U.S. Army Corps of
Engineers for helping resolve delay claims. The concept is to create an As-Built
Schedule or an updated schedule from the start of the project only to the point
just before the delay occurred. The “original,” or baseline, schedule is updated
with progress information and then compared to the impacted completion date
on another schedule on which a delay is included.
Updated Schedule —A revised schedule reflecting project information at a given
data date regarding completed activities, in-progress activities, and changes in
the logic, cost, and resources required and allocated at any activity level.
(Popescu and Charoenngam, 1995, p. 566).
Value Engineering (VE) —A science that studies the relative value of various
materials and construction techniques. Value engineering considers the initial
cost of construction, coupled with the estimated cost of maintenance, energy
use, life expectancy, and replacement cost.
Variation Order —See Change Order .
Work Breakdown Structure (WBS) —A task-oriented, detailed breakdown of
activities that organizes, defines, and graphically displays all of the work to be
accomplished in order to achieve the final objectives of a project. The WBS
breaks down the project into progressively more detailed levels. Each
descending level represents an increasingly detailed definition of a project
component. In CPM scheduling, the components at the lowest WBS level are
used as activities to build the project schedule.
Workdays —Days on which work was or is to be performed.
Work Package —A well-defined scope of work that terminates in a deliverable
product or completion of a service.
Zero Free Float —See as Late as Possible .
Zero Total Float —A constraint in some computer scheduling programs that assigns
a total float value of zero, causing the Early Dates to equal the Late Dates of the
activity.
Z-function —See Standard Normal Distribution .