System for generating a desired output gas from an input fuel for use in a downstream process, comprises: (a) several means for processing the fuel to generate the desired output gas, in which the processes includes means for using waste gas output from he downstream process to provide energy for the processing of the fuel, in which each of the processes is operational at a range of levels up to full capacity, and in which the processes are interconnected in a collective operating scheme to process the fuel; (b) means for controlling the processes in response to a dynamic load demand from the downstream operation, in which the controller is operative to adjust the operational level of each process to produce individual responses from each process; and (c) combining the individual responses to produce a collective response for meeting the dynamic load demand.    Also claimed is a method for generating a desired output gas from an input fuel for use in a downstream process.    Preferably each process is a fuel processing system which includes a burner having an input for receiving the waste gas from the downstream process and a reformer, and in which the burner combusts the waste gas to produce heat for use by the reformer to convert the fuel into the desired gas. The range of operational levels may vary between each process from idle to full capacity. The controller maximises the efficiency of the processes in the collective response, and includes communication with the downstream process to receive a dynamic load signal indicative of the demand. The processes have several fuel processing elements, in which each of the elements includes receiving the fuel, the waste gas, air and steam for use in the processing of the fuel.    USE -   System and method for generating an industrial gas from a hydrocarbon feed.    ADVANTAGE -   Industrial gas production is responsive to dynamic load demand of a downstream process and has a flexible operational range, to produce a desired gas for the downstream process, and which uses several fuel processing systems arranged as an interfunctional scheme.