48 C.F.R. § 52.236-1
As prescribed in 36.501(b), insert the following clause: [ Complete the clause by inserting the appropriate percentage consistent with the complexity and magnitude of the work and customary or necessary specialty subcontracting (see 36.501(a)). ]
PERFORMANCE OF WORK BY THE CONTRACTOR (APR 1984)
The Contractor shall perform on the site, and with its own organization, work equivalent to at least ___ [ insert the appropriate number in words followed by numerals in parentheses ] percent of the total amount of work to be performed under the contract. This percentage may be reduced by a supplemental agreement to this contract if, during performing the work, the Contractor requests a reduction and the Contracting Officer determines that the reduction would be to the advantage of the Government.
(End of clause)
48 C.F.R. §52.236-1