This course is part of a series which introduces the FAO damage and loss methodology, developed to support countries to generate precise and holistic data for the agricultural sector, in response to climate- and weather-related disasters. This course introduces the formulas which are used to compute damage and loss in the agricultural sectors (crops, livestock, forestry, aquaculture and fisheries). It then considers the data requirements and possible sources, and how the data can be used both to report on Sendai and Sustainable Development Goal (SDG) targets, and at national level.