This document discusses the different case systems in Dravidian languages such as Tamil and Malayalam. It outlines 14 cases including nominative, accusative, dative, sociative, instrumental, locative, genitive, ablative, comitative, and vocative. For each case, it provides examples from Tamil and Malayalam to illustrate how the case is marked morphologically and its semantic role in the sentence. It also lists the pronominal forms for each case in Malayalam.