Can Psychometricians Learn to Think Like Physicists?

In this article the author discusses professor Stephen Humphry's model of using metrology and physical science analogies to reformulate the relationship between discrimination and the unit. He reports on the metrology program developed by Humphry for humans and social science to follow. He states that Humphry's metrology program require the abandonment of descriptive Rasch models in favor of an explicit causal interpretation of the regression.