The Pittsburgh Steelers have revamped their passing attack this year courtesy of Offensive Coordinator Todd Haley.

The bar has been set with the recent success of the Cowboys, Patriots, Ravens, Chargers and Steelers’ 3-4 defenses, and now it has become vogue to run the scheme. As many as 15 teams are either making the switch or infusing elements of the 3-4 defense, but can they be successful? Here are five key ingredients that will make or break the transition.