The Independent Government Estimator weighs any premium costs allowed in the base-
contract change proposal against any additional impact costs requested. For example, the
Mechanical Contractors Association's productivity rates can be higher than those used in
competitively bid work. The estimator must avoid including the contractor's questionable
impact costs in the initial Government estimate unless each has been deemed justifiable.
Any offsets to impact costs from deleted work may increase the contractor's efficiency and
productivity, resulting in a credit to GSA.
estimator's support during negotiations
After the IGE for the modification has been completed, approved, and delivered to the
Contracting Officer, the Independent Government Estimator continues to support the
negotiations, as directed by the negotiator. The estimator must become thoroughly
familiar with negotiating requirements and techniques before participating as part of a
negotiating team. He or she marks all estimates "FOR OFFICIAL USE ONLY" to preserve
balance during negotiations. The overall amount must not be disclosed under any circum-
stances prior to award.
13 value-engineering change proposals (VECP's)
VECPs may require preparation of an IGE. Since a VECP will be supported by contractor pricing,
the estimator prepares the IGE in a manner similar to that defined previously in "Construction
Modifications and Claims Analysis" section (in Chapter 2.2).
14 risk management
The Independent Government Estimator assists in identifying and measuring risks, and then
in developing, selecting, implementing, and managing options for addressing those risks. The
several types of risk to be considered as part of a risk-management methodology include:
Schedule
Cost
Technical feasibility
Environmental remediation
Archaeological
project estimating requirements P-120
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section 2.2
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