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Just like a business continuity plan, a family preparedness plan is not complete until it is routinely tested and updated. At work, you and your co-workers must be familiar with your employer's business continuity or emergency plan and understand your role in that plan. Semi-annual plan reviews and exercises are the best method of keeping the plan current and the recovery teams competent in their ability to successfully execute the plan.
This is true for your family preparedness plan, too. Family members (regardless of their age or physical abilities) must actively participate and thoroughly understand the purpose of the plan and the importance of their respective roles in making the plan work successfully.