Mutual acknowledgement of terms and conditions under which a working relationship is conducted, or goods are transferred between parties. EXAMPLE: contract, memorandum, or agreement
Sources:
NIST SP 800-161r1
Mutual acknowledgement of terms and conditions under which a working relationship is conducted (e.g., memorandum of agreement or contract).
Sources:
NIST SP 800-160v1r1
from
ISO/IEC/IEEE 15288:2015