This paper basically argues for Pesetsky's (2004) hypothesis that Case is an uT (uninterpretable Tense feature) of DP (determiner phrase), call it uT analysis. The uT analysis treats the traditional distinction of structural Case such as [NOM] (nominative Case) and [ACC] (accusative Case) as an epiphenomenon, and instead treats Case as a single structural feature of uninterpretable Tense. By so doing, T, which bears the interpretable Tense feature (iT), checks off uT of DP, for the T feature of uT is redundant, according to the Economy Principle. At the same time, [iT] must not be deleted, ...