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The authors conducted a content analysis on the type, frequency, and intensity of use of various indicators of rigor for 68 qualitative research articles published between 1999 and 2014 in the Journal of Counseling & Development . The authors identified the most frequently listed and implemented strategies for the research articles. The authors found a significant engagement in rigor strategies across time, variations in intensity in strategy use, and a significant positive relationship between intensity of strategy use across time.
Hays et al. (Sun,) studied this question.