Answer:Diary research method
Explanation:
Diary method is a research in which qualitative information can be obtained through letting research participants write down about their everyday experiences(based on what is being researched) in a diary or journal studies
This method is mostly useful because participate may be more comfortable to write at their own private space than to be asked questions through an interview.
However this is dependent on an individual's commitment to write everyday constantly which may be an issue for most participants.