An improved assembly, test, packaging and/or processing system and a control system, each of which may be expanded or reduced in size, capability and/or capacity on a modular basis to suit or adapt to a number of different applications. The product assembly, test, packaging and/or processing system comprises a number of modules which are assembled and arranged as required. Pallets move between stations on the modules along track portions which cooperate with track portions on adjacent modules so other modules can be added without affecting the movement of the pallets. When those modules are added or removed, or when stations are added or removed, corresponding controllers in the control system are also added or removed.