The quality evaluation in research findings, both of quantitative and qualitative, needs a demonstrated trustworthiness and rigorist. Traditionally, validity and reliability evaluating in quantitative research focus on standardized data collection instruments. However, the validity and reliability in qualitative research, is still a questionable issue, especially when asking about scientific findings of the work. Moreover, both of the validity and reliability describe operational techniques supporting the rigor of the work: credibility, dependability, conformability, and transferability.