Déformation professionnelle is a French phrase, meaning a tendency to look at things from the point of view of one's own profession rather than from a broader perspective. It is often translated as "professional deformation" or "job conditioning". The implication is that professional training, and its related socialization, often result in a distortion of the way one views the world.
Alexis Carrel: "Chaque savant, grâce à une déformation professionnelle bien connue, s'imagine connaître l'être humain, tandis qu'il n'en saisit qu'une partie minuscule." / "Every specialist, owing to a well-known professional bias, believes that he understands the entire human being, while in reality he only grasps a tiny part of him." L'Homme, cet inconnu, Chapter 2, p. 43, Harper & Brothers, 1935. 
- Julia Bönisch, "Déformation professionnelle: Beruflich bedingte Missbildung" Süddeutsche Zeitung (November 30, 2007). Retrieved March 5, 2011 (German)
- Robert K. Merton Social Theory and Social Structure. Glencoe, IL: Free Press, 1957, p. 198: "The transition to a study of the negative aspects of bureaucracy is afforded by the application of Veblen's concept of “trained incapacity”, Dewey’s notion of “occupational psychosis” or Warnotte’s view of “professional deformation”."
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