Abstract: An improved modular decking system, the system including decking in the form of a plurality of treads, the decking being carried by one or more bearer members and the bearer members in turn being supported at or above ground level by one or more stumps. The decking system is such that engagement between bearer members and stumps is via a bearer locating system which includes a pivotable locating member providing a free coupling between a bearer member and its supporting stump. The decking system may include a tread locating system for engagement of bearer members with treads, the tread locating system including a locating pin suitable to locate the tread on the bearer member in a predetermined position, The decking system may also include a tread interlocking system for engagement of adjacent treads, the tread interlocking system including respective male and female members on adjacent treads to mate the adjacent treads.