BRISTOL, Connecticut (AP) – Here is a simple test for whether the three-person combination in the "Monday Night Football" booth is clicking:

"You want everybody who's watching to want to be in that fourth chair," said John Skipper, ESPN's executive vice president for content.

Viewers feel that way when the commentators enjoy a comfortable rapport. That was not always the case during ESPN's MNF debut last season with the team of Mike Tirico, Joe Theismann and Tony Kornheiser.

"We felt we had a better chance for the fourth chair to be attractive with a little different chemistry," Skipper said.

So Ron Jaworski, a longtime studio analyst, replaces Theismann this season. Jaworski has worked previously with every member of the MNF crew. He and Kornheiser are especially familiar with each other because of Jaworski's appearances on his colleague's radio and TV shows.