(a) Only contracting officers acting within the scope of their authority are empowered to execute contract modifications on behalf of the Government. Other Government personnel shall not- (1) Execute contract modifications;(2) Act in such a manner as to cause the contractor to believe that they have authority to bind the Government; or(3) Direct or encourage the contractor to perform work that should be the subject of a contract modification.(b) Contract modifications, including changes that could be issued unilaterally, shall be priced before their execution if this can be done without adversely affecting the interest of the Government. If a significant cost increase could result from a contract modification and time does not permit negotiation of a price, at least a ceiling price shall be negotiated unless impractical.(c) The Federal Acquisition Streamlining Act of 1994, Public Law 103-355 (FASA), and Section 4402 of the Clinger-Cohen Act of 1996, Public Law 104-106 , authorize, but do not require, contracting officers, if requested by the prime contractor, to modify contracts without requiring consideration to incorporate changes authorized by FASA or Clinger-Cohen Act amendments into existing contracts. Contracting officers are encouraged, if appropriate, to modify contracts without requiring consideration to incorporate these new policies. The contract modification should be accomplished by inserting into the contract, as a minimum, the current version of the applicable FAR clauses.48 FR 42386, 9/19/1983, as amended at 61 FR 18915, 4/29/1996; 61 FR 69298, 12/31/1996; 74 FR 28431, 6/15/2009