Final answer:
A Letter of Delegation should be used when a CO delegates signature authority in writing, detailing the authority scope, limitations, and duration to ensure clarity and avoid misuse.
Step-by-step explanation:
When the Contracting Officer (CO) delegates signature authority in writing, a special form or document known as a Letter of Delegation should be used. This formal document is typically used to grant another individual the authority to sign contracts, make binding decisions, or take official actions on behalf of the Contracting Officer. The delegation of authority should specify the scope, limitations, duration, and any other conditions under which the delegation is granted. It's crucial that the document is clear and comprehensive to avoid any misunderstandings or misuse of the delegated powers. Accurate record-keeping and adherence to organizational policies is also essential when dealing with delegation of signature authority.