Following the launch of the Aid for Trade (AfT) initiative in 2005, donor spending on interventions to promote developing country trade has grown rapidly (UNECA & WTO, 2017: p.3). These interventions can be divided into four categories (i) trade policy and regulation support; (ii) traderelated infrastructure support; (iii) productive capacity building (including trade development) and (iv) trade-related adjustment support. Interventions to promote trade are typically referred to as AfT projects or programmes in the literature, and this report will employ the same terminology. In the absence of directly relevant literature, this review summarises the state of the evidence on interventions to promote trade and what works, with a particular focus on regional projects. Though the evidence base is limited, it finds that there are emerging best practices in AfT programming. Some of these apply to all AfT interventions, and some are specific to regional projects.