This manual aims to introduce the concept of agricultural biodiversity, and its relevance to different aspects of agricultural production and farm management for smallholder farmers in East Africa. It includes eight different training modules, each covering a specific aspect related to agrobiodiversity. The modules draw on FAO’s long-standing experience in training farmers in the region, and particularly on the work carried out through the Farmer Field Schools (FFS) network in Kenya. Each module is standalone and can be used independently from the others, based on the user’s or project’s aim. The modules "crop diversity and food security" and "utilization and nutritional value of traditional crops" are relevant to the work of the International Treaty.