Which of the following is NOT a reason for unilateral modification of contracts?

Unilateral modifications to contracts allow one party, typically the government, to make changes without needing the consent of the other party. This can happen for various reasons, including changes in requirements, administrative changes, or scope adjustments.

A change in requirements, for instance, often occurs when the needs of the agency evolve after the contract is awarded, and they need to modify the contract accordingly. Administrative changes are alterations that do not affect the substantive rights of the parties, such as updating the address of the contract administrator. These types of changes can easily be made unilaterally.

On the other hand, a reduction of contract price typically requires mutual agreement, as it involves a renegotiation of the terms of the contract. This is because a reduction in price impacts the compensation structure agreed upon by both parties.

Performance issues, while they may lead to changes in how a contract is executed, usually don't justify a unilateral modification of the contract itself. These issues often require discussions and possible renegotiations between the contractor and the government, as they can fundamentally impact the contractual relationship and obligations. Thus, performance issues do not fit the framework for unilateral modifications.