Last year, Football Outsiders developed BackCAST, a metric that projects the likelihood of success for running back prospects in the NFL draft. Historically, a college running back with a good size-to-speed combination and high average yards per carry and who represented a large percentage of his college team's running attack is more likely to succeed at the pro level. BackCAST considers these factors and projects the degree to which the running back will exceed the NFL production of an "average" drafted running back during his first five years in the NFL.