Definition

This involves searching for and discussing elements of the data that do not support or appear to contradict patterns or explanations that are emerging from data analysis. 

Deviant case analysis is a process for refining an analysis until it can explain or account for a majority of cases.

Analysis of deviant cases may revise, broaden and confirm the patterns emerging from data analysis.

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References

Creswell, JW. (1998). Qualitative Inquiry and Research Design Choosing Among Five Traditions. Thousand Oaks, CA: Sage Publications.

Lincoln, YS. & Guba, EG. (1985). Naturalistic Inquiry. Newbury Park, CA: Sage Publications.

Mays, N. & Pope, C. (2000). "Qualtative research in health care:  Assessing quality in qualitative research." BMJ. 320(7226), 50-52.

Patton, MQ. (1999). "Enhancing the quality and credibility of qualitative analysis." HSR: Health Services Research. 34 (5) Part II. pp. 1189-1208.

Patton, MQ. (2001). Qualitative Evaluation and Research Methods (2nd Edition). Thousand oaks, CA: Sage Publications.