The Generation Challenge Programme (GCP) was a 10-year CGIAR Challenge Programme hosted at CIMMYT that aimed to use genetic diversity and plant science to improve crops for food security. Major achievements included genetic resources for 18 crops, genomic resources, improved germplasm, and capacity building. An external review found GCP performed well and met most goals. Lessons learned included the importance of effective governance, monitoring, linking research to applications, strategic partnerships, and transition planning.