A. Determining the client's mobility Important for safety and fall prevention, but not the first priority during care planning. B. Explaining the roles of the RN, licensed practical nurse, and assistive personnel This is part of orientation and education but does not help in personalized care planning. C. Introducing health care team members to the client While courteous and important for building rapport, it’s not the first step in individualized care planning. D. Understanding the client's routine for his own care at home This helps in personalizing the care plan to maintain the client’s independence and preferences, especially for older adults in long-term care.