The 4 important types of qualitative research are, Phenomenology - It is the philosophical study of events that happen naturally. It could be natural phenomena or experiences related to people. Ethnography - It is the scientific study of human beings along with their social environment, culture, and customs. Grounded Theory - It is the methodological process of developing theories based on systematic collection and analysis of relevant data. Case Study - It is a research-based study and analysis of a person, event, group, project, or situation.