Actor-Observer Bias
Fundamental Attribution Error
The notion that, in contrast to interpretations of their own behavior, people tend to (unduly) emphasize the agent's internal characteristics (character or intention), rather than external factors, in explaining other people's behavior — i.e. the tendency to believe that what people do reflects who they are.
Origin
In 1977, Lee Ross coined the term in his chapter "The Intuitive Psychologist and His Shortcomings," published in Advances in Experimental Social Psychology at Stanford University. Ross argued the bias was so pervasive it deserved to be called fundamental — a word his colleague Edward Jones later admitted he wished he had used first. The phenomenon had roots in a 1967 experiment by Jones and Victor Harris, but it was Ross who gave it its enduring name.