Leniency Bias in Evaluating Clinical Social Work Student Interns

Leniency bias, or the tendency to evaluate individuals more favorably than is warranted, can prevent accurate evaluation and constructive supervision. This study tested leniency bias among field instructors of 90 clinical social work interns by comparing face-to-face and anonymous field instructors’ ratings of students’ knowledge, values, and skills. We also compared students’ own ratings to field instructors’ assessments. Results indicated little variance and consistently high ratings when field instructors evaluated face-to-face. There was greater variance and lower mean ratings when supervisors evaluated anonymously. Students’ self-assessments were the most critical and best matched the anonymous evaluations; whereas, the anonymous and face-to-face field instructor evaluations significantly differed on most items. These findings suggest the need for evaluation training for field instructors and the use of multiple assessment methods.