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A Study of Text Analysis in Social Work Research Yasuyo Hiyori The purpose of this paper questions a meaning of reliability and validity and considers the way of qualitative study in social work research. It is often pointed out that reliability and validity in qualitative research is hard, but the software for text analysis helps us to solve this problem. When we treat big data, we can analyze the date effectively by using the software. However, it is hard to understand the context of the date by using text mining only. So, when we analyze text data in social work research, it is necessary to analyze quantitatively and qualitatively. Key words : Text analysis, Reliability, Validity, QDA, Text mining