The researcher is there to examine a case. They may review one case or review many cases. Cases tend to be unique to a given research topic that the researcher is trying to find further research on. The data in which it is collected may concern a particular individual or a group of people. In-depth interviews are often conducted to help find or determine in-depth information. Grounded Theory Grounded theory can be seen as another form of qualitative research, where the approach is to develop a theory from the data collected from the research. From this research tends to use in-depth interviews and focus on focus groups to get the bulk of the data they hope to be valid. Sample sizes for soil theory tend to be more limited; regarding this type of study it requires a lot of time. Historical Research Historical research can be seen as another form of qualitative research, where the event being studied happened in the past. This type of research looks morally at history and past life experiences. Looking at changes in depression over the years since the 19th century. This type of research brings the past back to the present. This will allow future studies to be conducted on this type of