- Interviews: Transcripts of interviews with people can provide valuable insights into their thoughts, feelings, and experiences.
- Observations: Detailed observations of people or situations can provide information about their behavior and interactions.
- Documents: Documents, such as letters, emails, and diaries, can provide historical information and insights into the thoughts and experiences of the people who wrote them.
- Photographs: Photographs can capture moments in time and provide visual evidence of events, people, and places.
- Videos: Videos can provide a more dynamic view of events and people than photographs, and can be used to capture interactions and behavior.
- Audio recordings: Audio recordings can capture conversations, speeches, and other sounds that can provide insights into people's thoughts and experiences.