Psychometrically oriented researchers construe low inter-rater reliability measures for expert peer reviewers as damning for the practice of peer review. I argue that this perspective overlooks different forms of normatively appropriate disagreement among reviewers. Of special interest are Kuhnian questions about the extent to which variance in reviewer ratings can be accounted for by normatively appropriate disagreements about how to interpret and apply evaluative criteria within disciplines during times of normal science. Until these empirical-cum-philosophical analyses are done, it will remain (...) unclear the extent to which low inter-rater reliability measures represent reasonable disagreement rather than arbitrary differences between reviewers. (shrink)