A similar version of the formula remains in play at Halas Hall, this one devised by former strength coach Rusty Jones and muscled up by current strength coach Jimmy Arthur.
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It's called the Athletic Index Score and Emery referred to it when discussing why the Bears chose certain players in the April draft.
But in the changing evaluation game, the Bears were searching for more. Much more.
Enter Mitch Tanney, director of analytics.
The Bears decided to join the growing number of teams that are playing moneyball in shoulder pads. Others who are going deep into analytics include the Ravens, Cowboys, Jaguars, Saints, Seahawks and Browns.
Tanney had been the manager of analytics for STATS. Emery became familiar with him after he became Bears general manager and he spent a day at STATS in Northbrook to see how the team could benefit from the company's services.
Emery and Tanney reconnected in March at the MIT Sloan Sports Analytics Conference.
"I always had a strong interest in this area," said Emery, who has quoted Pro Football Focus statistics in news conferences. "Going to that conference and meeting with Mitch helped me get my head around the analytics equation."
So when the team lost a couple of talent evaluators in the offseason, Emery saw an opportunity to restructure the front office and create a dimension.
But it's not like scouts no longer have a use for game tape. The Bears see analytics as one of many evaluative elements.
"Mitch's input is no more important than the tape, than the interview or than a high quality computer system," Emery said. "Analytics is part of it, not all of it. … We're not trying to find magic bullets. We're trying to get a little bit more out of the data we have because there is such an array of it."
The Bears believe Tanney can enhance their efforts in three ways.
The most important area is scouting.
"He is going to help us in analyzing (veteran) player statistical information to compare and contrast with other players in the league," Emery said. "He will help us in analyzing future prospects with all the various statistical information each player presents — performance scores on the field, medical scores, background testing and psychological profiling. He will dial down the important information and make it clear how it relates to performance."
Tanney also will help negotiator Cliff Stein with salary cap analytics and negotiation strategies.
And he will provide coach Marc Trestman and his staff with metrics that could give them an edge. Tanney is tracking trends for strategical purposes already, and the coaches also have given him special projects.
"There are so many elements that go into decision making besides the numbers," Trestman said. "But at least you can get percentages on what your chances may be.
"An example might be if you look at what the numbers say if it's fourth-and-1 on the 8. Is it better to go for it or take three (points)? If you don't get it, there is a good chance you'll get the three back if you have a good defense and you punt the ball. Or you can create a turnover because they are backed up and you stress their offense."
Trestman said he doesn't know a lot about analytics, but he is open-minded to learning more.
Emery jokes that he did not get past Algebra 101.
So Tanney has a very different way of looking at the game than anyone else at Halas Hall.
He was a quarterback and team captain at Monmouth College, where he graduated with a degree in mathematics. He played quarterback in the Arena Football League and other pro leagues and served as an assistant coach at Monmouth. At STATS, he helped create and manage advanced football statistics, including the company's ICE program that NFL teams use.
"There is a uniqueness in finding an ex-player involved in analytics and having a deep math background," Emery said. "And he had job experience in the sport. There aren't many people with all those qualifications. So he adds something to the group that can make us better."
This is a new era for the Bears' front office, and Tanney's presence is confirmation.