Abstract: A screening assembly 10 includes at least one rail 14 to be secured to a support member of a screening machine. At least one locating formation 16 extends from an operatively upper surface of the rail 14. Each locating formation 16 includes a catch member 32. The assembly 10 further includes a plurality of screening modules 12, each screening module 12 having an end supported on the rail 14. A pair of modules 12 lie in end-to-end abutting relationship with the abutting ends overlying the rail 14 so that the catch member 32 of each locating formation 16 protrudes beyond an upper surface of the screening modules 12. Further, a locking member 18 engages the catch member 32 of the locating formation 16 for locking the pair of modules 12 with respect to each other and with respect to the rail 14.