Scientists from across the world met from May 17-22, 2021 on the University of Georgia Griffin Campus to learn about the latest version of the Decision Support System for Agrotechnology Transfer (DSSAT) computer software program. The DSSAT crop modeling ecosystem helps researchers predict growth, development and yield of many cereal, grain legume, root, vegetables, and other crops in response to the genetics, weather and management (G * E * M). Since 2002, scientists, graduate students, and many others have met on the University of Georgia Griffin Campus for this international training program. This year, the 35 participants represented Bangladesh, Brazil, Colombia, Costa Rica, Egypt, Ecuador, Haiti, India, Pakistan, Mexico, Nepal, Nigeria, Taiwan, and the United States.