Background The aim of this study was to explore whether nursing staff retained knowledge, self-confidence, and attitudes 6 months after participating in a critical appraisal skills workshop. Method A retrospective matched case-control study was conducted to ascertain the effects of this training on the ability to appraise literature. Results Mean scores on the critical appraisal knowledge test, self-confidence, and attitudes were significantly higher in the case group compared to the control group (p < .001, p < .05, and p = .031, respectively). Conclusion Six months after the workshop, critical appraisal knowledge, self-confidence, and attitudes remained improved among the nursing staff who participated. This indicates that the workshop was effective for learning and can be used for clinical training. [J Contin Educ Nurs. 2022;53(8):372-378.].