Final answer:
Emergency preparedness plans should be reviewed and updated annually to account for any significant changes in staff assignments and premises layout to maintain their effectiveness.
Step-by-step explanation:
Emergency preparedness plans must be reviewed and updated at a minimum once every year to ensure that they reflect any significant changes in staff assignments, or the design and arrangement of the premises. This review is crucial for maintaining the effectiveness of the emergency plan, considering new risks, and ensuring that all personnel are clear on their roles during an emergency.
Continual assessment and adjustment of the emergency plan are fundamental for addressing any potential safety issues that may arise due to changes within the organization.