A psychologist that possesses even a crude understanding of variation … could no longer participate in continual refinement of instruments for rating people
Deming WE 1994 ‘The New Economics: For Industry, Government, Education’ MIT Press: Massachusetts p94
How much do we spend on psychometrics, rating systems and other processes which, at their heart, assume individual differences will account for performance differences?
In his book ‘Human Competence’, Gilbert shows that the big leverage in performance difference between individuals are caused by method, not attributes.
How much more could be achieved if the effort we put into assessing individuals were put into assessing the system and assessing method.