Types of contract modifications.

Contract modifications are of the following types: (a) Bilateral. A bilateral modification (supplemental agreement) is a contract modification that is signed by the contractor and the contracting officer. Bilateral modifications are used to— (1) Make negotiated equitable adjustments resulting from the issuance of a change order; (2) Definitize letter contracts; and (3) Reflect other agreements of the parties modifying the terms of contracts. (b) Unilateral. A unilateral modification is a contract modification that is signed only by the contracting officer. Unilateral modifications are used, for example, to— (1) Make administrative changes; (2) Issue change orders; (3) Make changes authorized by clauses other than a changes clause ( e.g., Property clause, Options clause, or Suspension of Work clause); and (4) Issue termination notices. [48 FR 42386, Sept. 19, 1983, as amended at 66 FR 2133, Jan. 10, 2001]