 What makes the “projection problem” problematic? If some part of the meaning of an expression α was never affected by the linguistic context in which α was embedded, that would be philosophically interesting, and would demand a theoretical explanation, but it would at least be trivial to completely describe the data: all presuppositional inferences would survive any embedding, end of story. But that isn’t what happens. Presuppositions typically project, but often do not, and most of the empirical and theoretical work on presupposition since the 1970s has been taken up with the task of describing and explaining when presuppositions project, and when they don’t.