Using switchgrass to produce biofuel is one way to decrease the United States’ dependence on oil, but growing it and making it profitable can be complicated. It lacks qualities, such as high biomass yield, needed to maximize biofuel production. To combat this issue, and breed switchgrass that has the optimal combination of these traits, the researchers tried evaluating plants using the Smith-Hazel Selection Index. This index allowed the researchers to estimate and combine information on multiple traits. It also looked at the economic value of each trait, which further maximizes the rating.