Final answer:
Aristotle uses habituation to determine a person's virtue by practicing doing what's right and gaining practical experience and familiarity.
Step-by-step explanation:
Aristotle uses a tool called habituation to determine a person's virtue. According to Aristotle, habituation refers to the practice of doing what is right in order to develop virtuous character. By consistently choosing the right action in different circumstances, individuals gain practical experience and familiarity, which enables them to identify the reasons why a certain action should be chosen in diverse situations. Through habituation, individuals become more aware of which action is supported by reason and get better at choosing it.