The Déformation Professionelle Bias

The tendency to look at things from the point of view of your profession and forget a broader perspective.

A French phrase, Déformation Professionnelle, is a pun on the expression "formation professionnelle," meaning "professional training." The implication is that all (or most) professional training results to some extent in a distortion of the way the professional views the world. "When the only tool you have is a hammer, every problem looks like a nail," is an adage describing this phenomenon.