Glossary - Construction Project Scheduling and Control - page 489

analysis, response planning, and controlling risk on a project (PMI,'s PMBOK,
5th Edition 2013).
Risk Register —A checklist of potential risks developed during the risk identification
phase of risk management.
Roll-up Schedule —See Summary Schedule .
SCurve —A cumulative curve plotting work progress against time. Work progress
may be expressed in terms of units of work, budget, man-hours, percent
complete, or something else. The curve loosely resembles the letter S because
work typically starts on a light scale and then intensifies toward the middle of the
project, and finally lightens up again toward the end of the project. The curve is
sometimes called lazy-S curve .
Schedule —A display of project activities and events, along with their timing, plotted
chronologically on a calendar. A schedule may or may not be based on the
critical path method (CPM) .
Schedule Acceleration —See Schedule Compression .
Schedule Compression —Shortening the project's schedule without reducing the
project's scope to meet certain time and/or cost objectives. Schedule
compression usually—but not always—increases the project's cost and often has
physical limitations as to how much the schedule can be shortened.
Schedule Contingency —An amount of time added to the base-estimated duration
to allow for unknown impacts to the project schedule or to achieve a certain
level of confidence in the estimated duration.
Schedule Crashing —See Schedule Compression .
Schedule of Values —A listing of elements, systems, items, or other subdivisions of
the work, establishing a value for each, the total of which equals the contract
sum. The schedule of values is used for establishing the cash flow of a project
and serves as the basis for payments requests ( RSMeans , 2010). Also called
project cost breakdown or simply cost breakdown .
Schedule Performance Index (SPI) —The ratio of work performed to work
scheduled. SPI = BCWP∕BCWS or SPI = EV∕PV.
Schedule Updating —Reflecting actual performance information in the schedule, in
time of occurrence and amount (or percentage) of performed work, as well as
implementing any changes to the future work on the schedule.
Schedule Variance (SV) —The difference between work performed and work
scheduled. SV = BCWP − BCWS or SV = EV − PV.
Scheduler —A project scheduling professional in charge of preparing and
updating a CPM schedule for a construction project. The scheduler is also
responsible for producing reports required by management pertaining to the
schedule.
Scheduling —See Project Scheduling .
Scope Creep —The continuous and gradual expansion of the scope of a project (size,
area, design, materials, etc.) after the contract has been signed, as a result of
multiple and successive owner-issued change orders. Scope creep usually results
from the owner's lack of vision, lack of appreciating the impact of changes on