That is, psychometricians claim to know something that they do not know and have erected barriers preserving their ignorance. This is pathological science.

Why psychometrics is not pathological a comment on Michell?

Although relevant to classical test theory, Michell's arguments do not apply to psychometrics in general. ... We conclude that, although Michell's arguments are important to psychological measurement, they are largely irrelevant to item response theory.

Is psychometrics a branch of psychology?

n. the branch of psychology concerned with the quantification and measurement of mental attributes, behavior, performance, and the like, as well as with the design, analysis, and improvement of the tests, questionnaires, and other instruments used in such measurement.