Since its launch in 2016, the Global Partnership Initiative on Effective Triangular Cooperation (GPI on effective TrC) has played a key role in advancing effective triangular co-operation as the leading platform for the exchange and dissemination of effective triangular co-operation cases, lessons learned, guidelines and operational tools. Its efforts have been consolidated in the Voluntary Guidelines for Effective Triangular Co-operation document, which were launched at the Second High-Level UN Conference on South-South Cooperation (BAPA+40) in March 2019. As triangular co-operation continues to evolve to respond to the requirements of the 2030 Agenda, development partners may wish to adopt and operationalize the Voluntary Guidelines and explore better Triangular Cooperation reporting to monitor and evaluate the effectiveness of triangular co-operation.