Which of the following is NOT a key consideration during the Deployment Phase?

The Deployment Phase in systems acquisition management focuses on preparing a system for use in an operational environment. This includes ensuring the system is supported adequately, training users on how to effectively engage with the system, and monitoring its performance to ensure it meets operational needs.

Budget formulation, while an essential aspect of the overall systems acquisition process, is primarily addressed during earlier phases, such as the planning and development stages. This phase is more concerned with how the system will be deployed and utilized rather than the financial planning associated with acquiring the system. Thus, it is not a key consideration during the Deployment Phase, making it the correct answer.

Operational support, user training, and performance monitoring are critical elements that ensure that the system is effectively adopted, utilized, and maintained post-deployment, directly impacting the success of the system in its operational context.