First Published in 1997. The present study examines the relation between two types of structural Case on the one hand, and the interpretation of NPs on the other. The author argues that there are two types of structural Case, to wit weak D-structural and strong S-structural Case. The hypothesis that links these two types of Case to different interpretations states that an object is interpreted as a generalized quantifier if and only if it bears strong Case. This title particularly considers the semantics of noun phrases and the weak-strong distinction.