I just posted an entry about the projected playoff teams, and there are several situations where tie-breakers could come in to play. So I thought I'd take a look at some scenarios and who would make it.
This post will take a look at the NFC West.
My computer projects St. Louis to win the division even though they won't be favored in the final game in Seattle. This is because Seattle has two tough opponents (Atlanta and Tampa Bay) and is expected to lose them while St. Louis doesn't have a shoe-in to win their next two but hosting them both will help. Should the Rams lose to the Chiefs (most likely one they'd lose) then the teams would tie at 7-9 and the Seahawks would win the tie-breaker on division record (4-2 vs 3-3).
So, if they tie and Seattle wins the final game, advantage Seattle on division record. If they tie and the Rams win the final game, advantage Rams on head-to-head. So it could come down to the final game and each team controls their own destiny and the Seahawks have the tie-breaker edge, but the Rams have the easier road and best chance to avoid a tie-breaker.