Most football fans in the South who turn on CBS at 1 p.m. Sunday to watch N.F.L. football will see Baltimore at Green Bay. A much smaller portion of the audience in the South — mostly those living in Florida — will see Jacksonville at Cleveland.

And then there is the pocket of TV viewers in Mississippi who will be shown Kansas City at the Giants. The Giants are a very bad team, and the Chiefs are not exactly Mississippi’s team.

So what’s the explanation?

On each Sunday during the football season, CBS and Fox broadcast several football games simultaneously, but send only one to your home. The process by which the networks decide which game you will see is called regionalization.

At CBS, the executives Rob Correa and Kelly Wood, along with a team of researchers and staff members, decide which one. Each week, they prepare a preliminary schedule for three weekends out, a tentative schedule for two weekends out and a final schedule for one weekend out.