In 2016 ICED undertook an extensive review of best practices found across DFID and other donor programmes which utilise technical assistance to improve investment in, and delivery of infrastructure in developing countries. The review undertook case studies of 10 high performing technical assistance programmes which had achieved significant outcomes in infrastructure delivery, finding a number of key success factors in programme design from flexibility, to awareness of political economy and a need to take a more nuanced approach to theories of change. These finding are set out here, and further details can be found in the 10 full case studies, also held in the ICED Evidence Library.