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Well managed, maintained and effective national infrastructure (NI) systems (i.e. energy, transport, water, waste, ICT) provide the backbone for economic growth and societal wellbeing. Traditionally, NI planning and implementation has been conducted in isolation, based upon fixed assumptions about the future. This fails to recognise both the long-term socio-economic, climate-related and technological challenges and uncertainties of the coming century and the growing interconnectivity between these individual infrastructure systems. Here we develop a methodology for generating a range of strategies for the provision of NI suitable for an integrated ‘system-of-systems’ assessment of NI's future management. To provide coherent links with policy choices, integrated strategies are developed at an aggregate level with a diversity of investment requirements, demand management techniques, and levels of …