Business strategist Jim Collins takes on this challenge in his latest book, How the Mighty Fall.

FORBES: Jim Collins's ''How the Mighty Fall.''

One way to detect whether this is the case for the NFL may be found in research led by Jim Collins and detailed in his 2009 book, How The Mighty Fall.

FORBES: At The Top Of The Game, Is The NFL Positioned To Fall?

How the mighty would fall is the ultimate never-finished play, but his particularly tragic twists in Ireland.

FORBES: The Mighty Irish Fall and Fall