An agreement should be signed in advance of any training by the employee, as an express written agreement or contractual agreement.

Test methods may be determined by standards, regulatory agencies, or contractual agreement, or may have to be created new.

Purchase orders are usually used as a contractual agreement with vendors to buy goods or services.

These design drawings were annotated as confidential, and customers received a contractual agreement of confidentiality with their purchase.

This alliance was a contractual agreement between the two peoples.