Rater Errors in Clinical Performance Assessments

Rater errors are some of the most significant validity threats to any performance assessment. Veterinary medical education routinely uses raters to assess student performance in a variety of scenarios (e.g., clinical assessments, OSCEs, etc.). The purpose of this "teaching tip" is to introduce veterinary medical educators to the notion of rater error, identify a list of common rater errors, and discuss how these errors can be addressed and minimized so as to produce accurate and defensible measures of student performance.