Journal of North Khorasan

Abstract In recent decades, qualitative approaches enter to the domain of medical research, and it has been considered. Rigor includes activities that increase the probability of obtaining valid results. Different approaches of qualitative research causing different methods for rigor has been achieved. In this methodology paper, by using descriptive and analytical methods has been tried that with introduction and overview of the types of rigor in qualitative research, Literature review and also address ways increase the type of rigor. In this study, Guba and Lincoln's approach(1994) include, Credibility, Transferability, Dependability, Confirm ability offer and methods to achieve the rigor of these four criteria has been suggested. Conclusions: According to the results of the research that has been done to generate knowledge, paying attention to the mentioned methods would help to judge precisely about the credibility of qualitative studies and obtain reasonable judgment.