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Early Hum Dev. 2019 Jun;133:69-71. doi: 10.1016/j.earlhumdev.2019.03.016. Epub 2019 Apr 1.

WASP (write a scientific paper): Sampling in qualitative research.

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Department of Public Health, Faculty of Medicine and Surgery, University of Malta, Malta. Electronic address:


This paper outlines key concepts and considerations pertaining to sampling in qualitative research as part of a series of articles on qualitative research methods aimed at a medical and health sciences audience with a predominantly quantitative background. Planning of the sampling approach, including within-case sampling, multiple-case sampling, sample size considerations and qualitative sampling strategies are addressed. Concepts specific to the qualitative paradigm, including the iterative approach and saturation are discussed and a framework for evaluating the rigour of qualitative sampling strategies is presented.


Qualitative research; Sampling

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