The prediction of the first-order wetting and drying scanning curves is attempted by two different methods. These are: Mualem model II and Poulovassilis and Kargas (P-K). Model II by Mualem was chosen deliberately as the most appropriate. Experimental Theta (S) data obtained in the laboratory for a sand mixture and a real soil were used for the comparison. Moreover, data presented originally by Poulovassilis (1970) were also used for the same purpose. It is shown that the P-K method gives better results than Mualem's model II. Some remarks on Mualem's model are also included.