Strength of schedule is calculated from the opponents projected fantasy points allowed for the DB position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
Week 15 Projections
Williams topped the 60-tackle mark for the second straight year in 2012, but his big plays (and thus his IDP production) backslid. There are also reports from Green Bay that Williams grip on a starting job is far from ironclad, so while there's some fantasy upside for owners in leagues that require the cornerback position there's quite a bit of risk with Williams as well.