Paragraph c of Clause 4-1: General Terms and Conditions and Clause B-37: Changes (Construction) allow the CO to make unilateral changes, as specified in the clause, within the general scope of the contract. These changes are accomplished by issuing written change orders.
The supplier must continue performing under the contract as changed, except under contracts that are not fixed-price or incrementally funded where the supplier is not obligated to continue or incur costs beyond the limits established in Clause B-31: (Reserved), or Clause B-32: Differing Site Conditions.
The Postal Service uses the established accounting procedures when analyzing the price or cost of changed work.