In which life cycle phase would the focus be on the utilization of the system?

The phase that emphasizes the utilization of the system is clearly designated as the Utilization phase. During this stage, the system is actively in use to fulfill its intended purpose and meet user needs. This phase is critical as it assesses system performance, ensures operational effectiveness, and may involve activities such as monitoring, maintenance, and user support.

Engagement with users during utilization allows for gathering feedback, which can be invaluable for informing future improvements or upgrades and ensuring that the system remains relevant and efficient throughout its operational life. This stage emphasizes continuous evaluation and adaptation in accordance with user experiences and changing requirements, which are crucial for the sustained success of the system.

Other phases, such as Development, Concept, and Retirement, each have distinct focuses: Development is centered on designing and building the system, while the Concept phase involves initial planning and specification of system requirements. The Retirement phase deals with decommissioning and transitioning the system out of active service. Thus, the focus on utilization is uniquely situated in the Utilization phase, making it the correct choice.