According to W. Edwards Deming, rating individual performance is an unfair practice because Blank______. Multiple choice question. differences between workers are almost entirely the result of the system they work in rather than the people an individual is part of a department and should not receive individual pay increases due to inequity issues the potential for managerial favoritism skews the results of performance ratings in almost every case the focus of quality work in a quality work system should be the customer, not the worker