Construction Delays and Other Claims - Construction Project Scheduling and Control - page 360

Updated Impact Schedule
The U.S. Army Corps of Engineers modified this method by creating an as-built sched-
ule or updated schedule from the start of the project only to the point just before the
delay occurred. The “original” or baseline schedule was updated with progress infor-
mation and then compared to the impacted completion date on another schedule on
which a delay was included (Callahan, Quackenbush, and Rowings, 1992).
As-Planned Schedule
The as-planned schedule describes the manner in which the contractor intended to
build the project. It is usually the same schedule that is submitted by the contractor to
the owner and then later becomes the baseline schedule (Popescu and Charoenngam,
1995). However, in some cases the originally submitted schedule may contain some
errors and need to be corrected (O'Brien and Plotnick, 2009, p. 480). When no CPM
schedule is required, or when it is required but not submitted, or when it is submitted
but not formally approved, it may be necessary to develop a revised or prototype
schedule using the best and most credible information available to reflect the original
plan and intentions (Wickwire, Driscoll, and Hurlbut, 2002, p. 377).
Comparison Schedule
The original schedule (usually, the as-planned schedule) is revised to incorporate any
claimed delays. Typically, for a delay claim, the contractor submits two schedules: one
without the causative factors (factors allegedly causing the schedule delays) and one
with the causative factors (called the “impacted” schedule). By comparing the two
schedules, the contractor hopes to prove that the delay was caused by the alleged
factors. The contractor may lump more than one factor in the delay claim. The inves-
tigator may then build an impacted schedule for each factor.
Accelerated Schedule
An accelerated schedule is a schedule submitted usually by the contractor, who imple-
ments some adjustment to the project baseline schedule in order to complete the
project by the contract finish date. By doing this, the contractor attempts to collect
the cost associated with the acceleration of the project. 22 The owner tries to make sure
that the contractor utilized all available float before any crashing takes place.
Recovery schedules (as discussed in Chapter 8) are similar to accelerated schedules
in the sense that both schedules make adjustments to compress the schedule (or the
remainder of it) to ensure the completion of the project by the contract finish date.
However, the main difference is in the reason for the delay that triggered the compres-
sion. Recovery schedules are mainly used when the contractor causes the delay and the
owner has become concerned and suspicious about the contractor's completion of the
22 Review the discussion about the cost of schedule compression in Chapter 8.