 In Feyerabend’s version of the incommensurability thesis, the semantic principles of construction underpinning a theory (in its realist interpretation) can be violated or “suspended” by another theory. As a result, theories cannot always be compared with respect to their content, as “rationalists” would like. It took Feyerabend a while to see it, for he did not officially subscribe to this view until the late 1960s, but this opens the door to relativism, the view that there is no objective way of choosing between theories or traditions. This is perhaps the most notorious and widely-reviled consequence of the contextual theory of meaning.