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 a pun on the expression formation professionnelle, meaning "professional training". The implication is that professional training often results in a distortion of the way one views the world.[1] The adage, "When the only tool you have is a hammer, every problem looks like a nail" characterizes this phenomenon.