Abstract: A screening assembly 10 includes at least one rail 14 to be secured to a support member of a screening machine to lie parallel to, and intermediate, side members of the screening machine. At least one retaining formation 18 stands proud of an operatively upper surface of each rail 14. The assembly includes a plurality of screening modules 12. Each screening module 12 comprises a supporting structure 64 and a removable screening element 66. The supporting structure 64 has an end supported on the rail 14 so that a pair of supporting structures 64 lie in end-to-end abutting relationship with the abutting ends, in use, overlying the rail 12 and defining a receiving formation through which the retaining formation 18 protrudes to project beyond the receiving formation into a recessed region defined by the abutting ends of the pair of supporting structures 64.