A key source of philosophical motivation for relativizing truth in the fashion of New Relativism traces to Lewis’s (1980) and Kaplan’s (1989) foundational work in semantics, according to which sentence truth is to be understood as relative to a circumstance of evaluation that includes world, time and location. New Relativists inherit the formal apparatus of Lewis and Kaplan and add another parameter, but their reasons for doing so are quite different from the reasons that motivated the framework in the first place. While Lewis’s and Kaplan’s reasons for “proliferating” parameters were primarily based on considerations to do with intensional operators (though see Yli-Vakkuri et al. 2019), the more contemporary reasons for adding a judge or standard parameter are often to do with respecting (for instance) disagreement data. (For further discussion here, see Kölbel (2015)). (Note that “old-style contextualism” can also be stated in Kaplan’s framework; it involves variation in content with respect to the context of utterance rather than in truth value with respect to the circumstance of evaluation).