list the 15 important validity strategies that are used during the conduct of a qualitative research study to help shift it from a study questionable value to a high-quality research study for meeting its purpose. data triangulation, extended fieldwork, external audit, investigator triangulation, low-inference descriptors, methods triangulation, negative case sampling, participant feedback, pattern matching, peer review, reflexivity, researcher as detective, rule out alternative explanations, theory triangulation,
