The work of the Centre for Tax Policy and Administration (CTPA) has changed dramatically in recent years, including in relation to the role of development and developing countries in our work. I am proud that an increasing number of developing countries are now integrated into our work, as equal members of the Global Forum on Transparency and Exchange of Information for Tax Purposes (the Global Forum) and the OECD/G20 Inclusive Framework on BEPS (the Inclusive Framework), with a voice on the creation and implementation of new international tax standards. This has been an evolving process. As globalisation increased, the challenges of cross-border taxation have extended beyond the OECD membership, and the CTPA accelerated our dialogue with developing countries accordingly. This started with our Global Relations Programme (GRP) in the early 90’s which has provided training and capacity building for over 25 000 tax officials from the developing world. Since then, we have created a Task Force on Tax and Development, we have expanded our Global Revenue Statistics database to cover more than 90 countries by the end of 2018, we have established audit programmes through our Tax Inspectors Without Borders (TIWB) initiative and we have set up tax crime investigation academies throughout the world. Of greatest significance however has been the establishment of the Global Forum and the Inclusive Framework, which have brought dozens of developing countries into the heart of the work of the CTPA. This has fundamentally changed the nature of how we operate, ensuring development is an integral concern across all of our work. It has also raised expectations as the CTPA is now seen as a key actor in the Domestic Resource Mobilisation (DRM) agenda. This process has been inspired by the wider development landscape, most recently with the Addis Ababa Action Agenda (AAAA) and the Sustainable Development Goals (SDGs). These agreements provide both a framework and a vision for how we can continue to develop international co-operaton in taxation to benefit development. The CTPA has been, and will continue to be, inspired by that vision that sees development as a universal agenda, and we will continue to mainstream development across all of our work. This booklet sets out how we have been doing this, and how we intend to do more in the future. (2018-19).