5.00 to 4.00 -- Franchise Prospect -- A player who can change the course of a game and a consistent performer. Multiple Pro Bowl possibilities and top ten selection.
3.99 to 3.10 -- Quality Prospect -- Someone that consistently gives good performances. Occasional Pro Bowl appearances.
3.09 to 2.75 -- First-Year Contributor -- Prospect that has the ability to make plays from the get-go and start early into his rookie season.
2.74 to 2.45 -- Future Starter -- A good athlete that must learn to be a football player or someone who is an "overachiever". Quality prospect with long term potential
2.44 to 2.35 -- Fence Player -- Prospect on the fence that has the skills and abilities to succeed but needs time and patience to develop those skills to the fullest.
2.34 to 1.99 -- Practice Squad -- Late-round draft pick or priority free agent that must develop his talents on the practice squad
1.98 to 1.50 -- Free Agent -- Player who will make a 60 or 80 man roster.
Read more:
http://sportsillustrated.cnn.com/football/nfl/draft-2011/grading_system/index.html#ixzz1JdOyxbwG