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...Family practice vol no oxford university press printed in great britain sampling for qualitative research martin n marshall mn the probability techniques used quantitative studies are rarely appropriate when conducting this article considers and explains differences between two approaches describes three broad categories of naturalistic convenience judgement theoretical models principles illustrated with practical downloaded from https academic oup com fampra by guest on september examples author s own keyword introduction a representative sample most common approach benefits to health care is use random or samples becoming increasingly recognized both nature population defined all academics clinicians but misunderstandings about members have an equal chance selection stratified philosophical basis methodological area variants remain impression sometimes given that which allow subgroups be studied differs hypothetico greater detail deductive model simply terms way data size determined ...