Which type of qualitative research involves a long time study of a person group organization or a situation and six to find answers why such thing occurs to the subject?

What is qualitative research?

Qualitative research is a process of naturalistic inquiry that seeks an in-depth understanding of social phenomena within their natural setting. It focuses on the "why" rather than the "what" of social phenomena and relies on the direct experiences of human beings as meaning-making agents in their every day lives. Rather than by logical and statistical procedures, qualitative researchers use multiple systems of inquiry for the study of human phenomena including biography, case study, historical analysis, discourse analysis, ethnography, grounded theory, and phenomenology.

University of Utah College of Nursing, (n.d.). What is qualitative research? [Guide] Retrieved from https://nursing.utah.edu/research/qualitative-research/what-is-qualitative-research.php#what 

The following video will explain the fundamentals of qualitative research.

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This involves a long-time study of a person, group, organization, or situation. It seeks to find answers to why such thing occurs to the subject.Varieties of data collection methods such as interviews, questionnaires, observations, and documentary analysis are used in a case study.Kinds of Qualitative Research