Section 411.404 - Contract clauses(a) The contracting officer shall insert the clause at 452.211-74, Period of Performance, when it is necessary to specify a period of performance, beginning on the date of award, date of receipt of notice of award, or a specified date.(b) The contracting officer shall insert the clause at 452.211-75, Effective Period of the Contract, when it is necessary to specify the effective period of the contract.63 FR 26995, May 15, 1998