John interviews 10 people about their memories from the first three years of their lives. He then writes an essay about early memory in humans. Which research method did he use to collect his data?

Question

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John used a case study research method, which involves collecting detailed information from a small group or individual to gain insight into a particular phenomenon. In this case, he collected memories from 10 individuals about their first three years of life to gain insight into early memory in humans.

John Interviews 10 People About Their Memories from the First