qualitative research should be evaluated by criteria that have been specially developed for it.qualitative and quantitative research should be evaluated by the same criteria.There are several distinct perspectives on the quality of qualitative research (Murphy et al., 1998), some of which are listed below. No single or unitary concept of validity exists in qualitative research which is comparable to its meaning in quantitative inquiry, and as Onwuegbuzie and Leech (2007: 233) state: ‘to date, no one definition of validity represents a hegemony in qualitative research’ no one idea of validity dominates. Ways of reflecting on validity have reached a variety of conclusions. Health researchers too must not only consider the ‘truth value’ of their studies but also demonstrate that it is credible and valid for professional practice, and that it has quality. All research is rightly open to scrutiny from its readers.
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