AIM The aim of the study was to establish reliability and validity of the Competency Assessment in Simulation of Electronic Health Records (CASE) tool. BACKGROUND Effective teaching and learning practices, including valid and reliable assessment of students' electronic health record (EHR) competency, contribute to safe, high-quality, efficient nursing care. METHOD The study used a mixed-methods design to test reliability and validity of the CASE tool. RESULTS A nationally representative sample of faculty from universities representing 27 states provided scores for videos using the CASE tool. Forty-seven participants completed the first scoring survey; 22 of the 47 participants (47%) completed the second-round scoring. Intraclass correlation for the final score between the first and second responses shows the consistency of test-retest reliability (ICC = .78, p < .001). CONCLUSION The CASE tool provided evidence of validity and reliability in evaluating EHR competency in simulation. [ABSTRACT FROM AUTHOR]