Final answer:
System maintenance is not considered a part of the systems implementation phase, which includes activities like computer resource acquisition, software and hardware installation, and site preparation. System maintenance occurs after the system is operational.
Step-by-step explanation:
The systems implementation phase is an important part of the systems development life cycle, which involves the transition from system design to actual operation. This phase includes several vital activities such as computer resource acquisition, software and hardware installation, and site preparation. However, system maintenance is not typically included in this phase as it refers to the activities performed after the system is implemented and operational. Maintenance is aimed at keeping the system running smoothly and effectively, and involves making necessary updates and improvements over time.