 Much contemporary work on presupposition has been devoted to case studies of particular triggers or families of triggers. More often than not, these studies end up granting some sort of special consideration to the trigger(s) in question. We have already seen instances of trigger differentiation above; for example, anaphoric accounts identify a class of triggers whose content is "descriptively poor" to explain why their presuppositions are more difficult to accommodate than those of other triggers (see Sections 5.1 &amp; 5.3). Researchers have noted more and more ways in which the presuppositions of triggers differ, mostly focused around questions of how robustly the presupposition projects and in what sorts of contexts the presupposition disappears.