Aug 072011

Deliberate Practice and Acquisition of Expert Performance: A General Overview

Deliberate Practice: K. Anders Ericsson PhD

Deliberate Practice: Article first published online: 5 SEP 2008

Traditionally, professional expertise has been judged by length of experience, reputation, and perceived mastery of knowledge and skill. Unfortunately, recent research demonstrates only a weak relationship between these indicators of expertise and actual, observed performance. In fact, observed performance does not necessarily correlate with greater professional experience. Expert performance can, however, be traced to active engagement in deliberate practice (DP), where training (often designed and arranged by their teachers and coaches) is focused on improving particular tasks. Deliberate Practice  also involves the provision of immediate feedback, time for problem-solving and evaluation, and opportunities for repeated performance to refine behavior. In this article, we draw upon the principles of deliberate practice established in other domains, such as chess, music, typing, and sports to provide insight into developing expert performance in medicine.

Education and training have a very long history. Ever since Greek civilization, there has been an important distinction made between general education and vocational training, which requires the acquisition of a high level of skill. Education, as proposed by Plato and Aristotle, discouraged specialization and focused on developing thinking skills and general knowledge. With respect to skilled manual work, primarily performed by slaves in Athens,1 Plato proposed an early start of training and restricted engagement to a single craft.2,3 When discussing medical expertise, Plato contrasted the routine application of medical procedures by a slave doctor to the thoughtful diagnosis and reasoning about treatment and explanation to the patient by an expert doctor.4 Competency among doctors was thus thought to be best assessed by examining their superior knowledge5 and ability to teach others.6 The primary additional factor to achieve competence was believed to be due to accumulated experience, and thus age was expected to be correlated with wisdom. Plato argued that the ideal doctor was one with significant experience—ideally, personal experiences of recovering from many diseases.7

Since Aristotle, the issues of how to evaluate and certify expertise and the tension between theoretical understanding and practical skill have remained. The level of expertise of practitioners has been monitored and credentialed by guilds and more recently by professional organizations.8 In the United States, students typically require a general education, such as a college education, before they can be admitted to study at professional schools. Following primarily theoretical training at professional schools, graduates are trained as apprentices to experienced practitioners until they earn the credentials to practice independently.

Consistent with the distinction between general theoretical knowledge and professional skill, early traditional models of skill and expertise9–13 distinguish different stages of development. The first stage (novice) involves following the teachers’ instruction and applying rules and procedures step by step. With increasing experience, the student becomes more able to generate the same outcomes faster and more efficiently. After extensive experience, individuals become experts and are able to respond rapidly and intuitively. Some domains, such as driving a car, are simple and “almost all novices [beginners] can eventually reach the level we call expert.”11 In other more complex domains, such as telegraphy and chess, it may take decades to reach the highest levels.13,14 Some researchers even explicitly reject the idea that expert behavior and performance needs to be uniformly superior to less experienced individuals.11 The pioneering research on expertise13 emphasized improvements in performance due to experience in the domain. In studies of medical doctors and nurses, it was typical to search for experts by using peer-nomination procedures among highly experienced professionals.9,15,16

In the 1980s the definition of expertise based on accumulated knowledge, extensive professional experience, and peer nominations was becoming increasingly criticized. Numerous empirical examples were reported where “experts” with extensive experience and extended education were unable to make better decisions than their less skilled peers or even sometimes than their secretaries.17 Early studies were unable to establish superior accuracy of the peer-nominated best general physicians, when compared to a group of undistinguished physicians.15,16 Similar findings were subsequently attained for clinical psychotherapists, where more advanced training and longer professional experience were unrelated to the quality and efficiency of treatment outcomes.18 In addition, examinations of the cognitive mechanisms that mediated the actions of individuals exhibiting consistently superior performance revealed a complex structure that could not be accounted for by a mere accumulation of experience and knowledge.19 In response to these criticisms, Ericsson and Smith19 proposed the redirection of research from studying the behavior of socially recognized experts toward the study of reproducibly superior performance in a given domain.

deliberate practice


Anders Ericsson, K. (2008), Deliberate Practice and Acquisition of Expert Performance: A General Overview. Academic Emergency Medicine, 15: 988–994. doi: 10.1111/j.1553-2712.2008.00227.x

Author Information

  1. From the Department of Psychology Florida State University, Florida, Tallahassee, FL.

*Correspondence: Address for correspondence and reprints: K. Anders Ericsson, PhD; e-mail:

  1. Presented at the 2008 Academic Emergency Medicine Consensus Conference, “The Science of Simulation in Healthcare: Defining and Developing Clinical Expertise,” Washington, DC, May 28, 2008.


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