The CSI compendium develops the concept of climate-smart irrigation (CSI) as an integral part of climate-smart agriculture (CSA) and intends to complement the existing literature and guidance on CSA published by the Global Alliance for Climate-Smart Agriculture (GACSA), FAO, CCAFS, the World Bank, Cornell University, and others. In the first section, the compendium presents the objectives of CSI, as derived from the three pillars of CSA, and puts CSI in context with ‘good irrigation practices’.