Modular scaffold system that provides access scaffolding and formwork slab support suitable for use in a wide variety of applications from light, medium to heavy duty scaffolding and shoring for building and other civil engineering works. It can be used for both scaffolding and shoring systems. Minimum supervision is required since the system is rapidly erected and dismantled using the interlocking component which are rigidyl secured with two cups. Simply hammered with no need for spanners. Due to hte lightness of the system componets, all can be easily handled by one man, ledgers are non-load bearing and can therefone be assembled at hand rail height on external faces of independed scaffolding, thus offering the additional safety of handrails at all working levels at no extra cost. Working levels can be changed speedily and simply without disturbing the main structure of the scaffold. Cup-Lock verticals are manufactured from high quality tube of the same outside diameter as traditional scaffold tube to facilitate tying scaffold to the building.