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Can sample size in qualitative research be determined a priori?

Sim, J; Saunders, B; Waterfield, J; Kingstone, T

Can sample size in qualitative research be determined a priori? Thumbnail


J Waterfield


There has been considerable recent interest in methods of determining sample size for qualitative research a priori, rather than through an adaptive approach such as saturation. Extending previous literature in this area, we identify four distinct approaches to determining sample size in this way: rules of thumb, conceptual models, numerical guidelines derived from empirical studies, and statistical formulae. Through critical discussion of these approaches, we argue that each embodies one or more questionable philosophical or methodological assumptions, namely: a naïve realist ontology; a focus on themes as enumerable ‘instances’, rather than in more conceptual terms; an incompatibility with an inductive approach to analysis; inappropriate statistical assumptions in the use of formulae; and an unwarranted assumption of generality across qualitative methods. We conclude that, whilst meeting certain practical demands, determining qualitative sample size a priori is an inherently problematic approach, especially in more interpretive models of qualitative research.


Sim, J., Saunders, B., Waterfield, J., & Kingstone, T. (2018). Can sample size in qualitative research be determined a priori?. International Journal of Social Research Methodology, 5,

Journal Article Type Other
Acceptance Date Mar 15, 2018
Publication Date Mar 27, 2018
Journal Internatonal Journal of Social Research methodlology
Print ISSN 1364-5579
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 5
Keywords sampling; sample size; qualitative research
Publisher URL


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