Deliberate Practice and the Acquisition and Maintenance of Expert Performance in Medicine and Related Domains (2004)

The factors that cause large individual differences in professional achievement are only partially understood. Nobody becomes an outstanding professional without experience, but extensive experience does not invariably lead people to become experts. When individuals are first introduced to a professional domain after completing their education, they are often overwhelmed and rely on help from others to accomplish their responsibilities. After months or years of experience, they attain an acceptable level of proficiency and are able to work independently. Although everyone in a given domain tends to improve with experience initially, some develop faster than others and continue to improve during ensuing years. These individuals are eventually recognized as experts and masters. In contrast, most professionals reach a stable, average level of performance within a relatively short time frame and maintain this mediocre status for the rest of their careers. The nature of the individual differences that cause the large variability in attained performance is still debated. The most common explanation is that achievement in a given domain is limited by innate factors that cannot be changed through experience and training; hence, limits of attainable performance are determined by one's basic endowments, such as abilities, mental capacities, and innate talents. Educators with this widely held view of professional development have focused on identifying and selecting students who possess the necessary innate talents that would allow them to reach expert levels with adequate experience. 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