The process of working through contract changes with the government can sometimes be quite challenging because there is always an element of subjectivity involved.  A common problem faced by contractors is when a contracting officer requests extra work without authorizing appropriate changes in the contract price.  In such instances, the contractor may be faced with the prospect of losing money by performing without compensation, or potentially entering into a dispute by asking to be compensated.  Other difficulties arise when contracting officers request changes so far outside the original scope of work as to raise questions in  regard to the contractor's ability to perform.