Abstract: A tread and bearer member locating system for a modular decking system, the modular decking system including decking in the form of a plurality of treads, and the decking being carried by one or more bearer members. The treads are elongate and have a longitudinal axis, a topside, an underside and a lateral width. The tread and bearer member locating system includes treads and bearer members, wherein the underside of at least one tread includes, at or near each end thereof, a bearer member receiving area, at least one of the bearer member receiving areas being bound longitudinally between a pair of spaced apart, downwardly extending locating projections, and laterally between opposed coupling members capable of, in use, coupling with correspondingly shaped coupling members in adjacent treads.