The ad hoc routing protocol's design has received a huge attention due to the unpredictable and rapid mobility of a node. It is created dynamically without any infrastructure. In ad hoc each node is responsible for routing the information between them. To improve the performance of unused information and to overcome the overhead in maintaining this information the protocols were designed. MANET (Mobile Ad hoc Network) is the collection of wireless mobile nodes which can dynamically form a network. By this definition we can conclude that there is no centralized administration, permanent topology and standard support services. Rough set theory is a computing technique to deal with uncertainty and vagueness. The notion of the thresholds and the temporal extensions to Rough Sets was applied in several protocols. The successful routing in MANETs using the Random Waypoint mobility model was based on various rough sets based protocol.