Q- How big, or small should a sample be in qualitative research?
A- It is not the number of cases that matters, it is what we do with them that counts. Sample size is frequently used to determine the quality of qualitative (and quantitative) research design, as Emma Uprichard (2013: 7) observes. But this criteria should be rendered meaningless ‘without further explanation as to what, how and why [it] may matter in the first place.’
And here is the presentation power-of-small-samples