Question: Is it legally permissible for the Government to re-establish a delivery schedule unilaterally on a contract for commercial services that includes FAR 52-212-4(c), when the Government, through its inaction, previously waived timely delivery (DeVito waiver?) Scenario: Agency enters into a contract for a critical IT system. The contract specifies that the contractor must fully implement the system within 60-90 days after the contract award date.  The contractor misses the required co