The invention relates to a method and an injection-molding machine with modular structure. In the solution proposed, to optimize logistics, in particular transport, the design and the construction of at least the mould-clamping mechanism side (7) and the injection system side (8) of the machine are modular. There are central unitary mounting and coupling interfaces (13 and 14 or 15, 15′, 15′) by way of which a mould-clamping module (1), a system module (16) and a drive module (17) are connected. The three modules can be selected freely from appropriate ranges of mould-clamping modules and system modules and drive modules.