Final answer:
MEMO must coordinate with the Contracting Officer prior to entering into an agreement with a vendor for informal user testing to ensure adherence to guidelines and regulations.
Step-by-step explanation:
Before MEMO enters into any agreement with a vendor for informal user testing, they need to coordinate with the Contracting Officer. The contracting officer is responsible for ensuring that all agreements and contracts adhere to the appropriate policies, guidelines, and regulations. Therefore, it is essential that MEMO collaborates with the contracting officer to verify that all aspects of the agreement are in compliance with legal and organizational standards.