A number of statistical assumptions are made in the application of his (Thurstone's) attitude scale e. g. that the scale values of the statements are independent of the attitude distribution of the readers who sort the statements assumptions which as Thurstone points out, cannot always be verified. The method is more over laborious. It seems legitimate to Enquirer whether it actually does its work better than the simple scales which may be employed and the same breath to ask also whether it is not possible to construct equally reliable scales without making unnecessary statistical assumptions.

Likert, Rensis. "A technique for the measurement of attitudes." Archives of psychology (1932). p. 7