Answer: He should conduct an in-depth interview
Step-by-step explanation:
What is an In-Depth Interview?
An in depth interview refers to a qualitative techniques used in research whereby participants are interviewed in deep details.
It is usually carried out using a few number of participants which makes it easier to focus on a single idea and ask deeper questions and most likely get detailed responses and scrutinize those responses in details along with the participants
It gives an ability for both interviewer and interviewee to communicate freely as they discuss extra points .
A researcher is able to get quality results due to a minor number of participants which allows a closer interaction and the researcher can have a closer focus to the topic or idea.