Spend any time reading or listening to draft coverage in the NFL, and you will quickly encounter the idea of a draft value trade charts. Essentially, the idea is that each draft pick has a certain value attached to it, and that when two teams want to trade picks, they consult a third-party reference, a chart, to figure out the general value of each selection.
So far, this makes a lot of sense. However, talking heads, journalists, and bloggers (such as myself) frequently disagree about what chart should be used. There is the famed Jimmy Johnson chart—older than most of the players currently active in the NFL.