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A little more than 10 years ago, the objective structured clinical examination (OSCE) was introduced. It includes several “stations,”; at which examinees perform a variety of clinical tasks. Although an OSCE may involve a range of testing methods, standardized patients (SPs), who are nonphysicians trained to play the role of a patient, are commonly used to assess clinical skills. This article provides a comprehensive review of large‐scale studies of the psychometric characteristics of SP‐based tests.

Across studies, reliability analyses consistently indicate that the major source of measurement error is variation in examinee performance from station to station (termed content specificity in the medical‐problem‐solving literature). As a consequence, tests must include large numbers of stations to obtain a stable, reproducible assessment of examinee skills. Disagreements among raters observing examinee …