There are a variety of synonyms for the phrase "one person at a time." Some alternatives include "one individual at a time," "one person per instance," or "one person in succession." Other options could include "one at a time," "one by one," or "individually." These phrases all convey the same idea of taking things step by step or focusing on one individual at a given moment. Whether you're talking about a customer service approach, a method for organizing a group activity, or a way of approaching a project, the concept of addressing one person at a time can be an effective and efficient approach.