This paper presents methodological paradigms : quantitative positivistic (logical empiricism) as the received tradition m the scientific inquiry and qualitative naturalistic (post-positivism or naturalism) as a new paradigm in the Kuhnian sense. Various kind of qualitative methods under the umbrella term, qualitative inquiry, were briefly introduced, Datails on the definition, epistemology, naming of subject, field technique (participant observation and ethnographic interview) of ethnographic research method as an adequate method for studying on the unique nursing phenomena in Korean culture were done. Besides, the concept of triangulation, issues on the methododogical paradigm, a criteria for rigor of qualitative naturalistic inquiry were mentioned.