The researchers studied different tef genotypes to find ones that give high and consistent grain yields across different environments. They used a method called GGE biplot analysis to analyze the data. They found that some genotypes performed well in all test locations, while others varied in their performance. One genotype, G4 (RIL-77C), stood out as both high-yielding and stable in all environments tested. They also identified one specific test location, Adadi-2014, as the best place to evaluate tef genotypes.