What is the difference between an etic and emic approach? What's an imposed etic?

The etic and emic approaches in psychology are used to understand cultural bias in the study of human behaviour. The distinction between the two was proposed by John Berry in 1969. An etic approach looks at behaviour from the outside of a given culture, and attempts to find trends that can be generalised, universal behaviours. Whereas an emic approach functions within certain cultures, aiming to identify behaviours relative to to that culture. A lot of research in psychology is guilty of imposed etic, assuming that findings from a study in one culture can be applied universally, when in fact they are only relative to the culture in which they were studied. A key example of this is Ainsworth's Strange Situation, she studied behaviour in America and applied the 'ideal attachment type' in America, to the rest of the world, leading to results affected by cultural bias because child rearing practices largely vary across the world.