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With a roster that includes 20 of 22 possible starters returning on offense and defense, there hasn't been much turnover inside the Green Bay Packers locker room.

That doesn't mean coach Mike McCarthy can't learn new things about his team.

McCarthy said he likes to go back over old notes during the offseason, a process of self-scouting that can be revealing for a head coach. Entering the 2015 season, he's started doing even more of it.

"Just spend more time on ourselves," McCarthy said. "I think like a lot of things when you go back, I like to go back and look at old notes and old things during the break and in the summer. It's something that I've always tried to stay on top of. Marty Schottenheimer has been really ringing in my head, really strong about, 'You've just got to make sure that you are who you think you are.' Staying in-tune with exactly what you're doing, what's on video, and it's that balance of perception versus reality."

Aside from old notes, McCarthy said he also wants to start looking at football analytics. With fewer responsibilities on offense, he'll have more time to delve into them.

McCarthy shed his play-calling duties this offseason, handing them to associate head coach Tom Clements. In the spring, he used organized team activities to figure out how to best spend his practice time. It's a process that will carry into training camp, he said.

"My job responsibilities are not written or distinctly laid out yet," McCarthy said. "I'm still working through the schedule of where I'm going to be every single day, and really I'm going to let training camp define it. I'm going to continue to learn from the people I trust in the industry, and I've looked at some things, but every place is different. It has to fit our staff, and it has to fit what we're trying to get done each and every day."

-- rwood@gannett.com and follow him on Twitter @ByRyanWood

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