PHILADELPHIA — Sean Mannion keeps a framed version of the football notes and play drawings of a 7-year-old in his office.As a child tagging along with his father to high school summer passing tournaments, he took notes on a yellow legal pad like his father did as a high school coach. When Mannion became an assistant coach in Green Bay two years ago, his father framed the 27-year-old notes and gifted them to Mannion. They hang in Mannion’s office as a reminder of a job he’s long envisioned.“The scheme has evolved since then,” Mannon said to a laugh on Thursday.And what will that scheme look like this season? That’s one of the pressing questions surrounding Mannion, the Eagles’ first-year offensive coordinator. The Eagles have kept Mannion behind the scenes since hiring him in January. Nearly four months after he replaced Kevin Patullo, the 34-year-old, first-time play-caller met with reporters and was in front of cameras for Philadelphia fans. It was an anticipated day for a coach who remains a mystery and whose success will help determine how the Eagles perform this season.“I’ve always been kind of working towards the hope of getting the opportunity to do this,” said Mannion, who spent nine seasons as a backup quarterback in the NFL and coached in Green Bay the past two seasons. “So even in Green Bay, you’re always going through, as the quarterback coach, you’re saying, “Alright, what calls do I have to have Jordan Love ready for?” You’re kind of thinking through the process of the game throughout the week, ‘What’s Matt (LaFleur) going to look to call here? What’s my favorite third-down call?’ You’re always kind of taking yourself through that process mentally. It was the same thing as a player. You’re saying, ‘Hey, what’s my favorite call in the high red zone?’ If it’s a high blitz game, what’s my favorite call? When am I going to come to the sideline and be like, ‘Hey, can I get this one on our next third medium where you might be getting a lot of pressure?’ You’re always taking yourself through that process, kind of flexing those muscles.“Then even now, scripting practice, you’re still going through that same operation. ‘Hey, it’s first and 10, it’s second and eight, it’s third and eight. What are the things that I really want us to get work on for those specific situations?’ So, you’re always putting yourself through those paces.”Mannion was an outside-the-box hire that even defied the Eagles’ initial plans for the position. When Nick Sirianni moved on from Patullo, the heavy lean was toward a coach with play-calling experience. It was the natural place to turn after Patullo and Brian Johnson were one-and-done hires without play-calling experience. Recent history suggests the boom-or-bust nature of the Eagles’ offensive coordinator job. They’ve had three offensive coordinators (each with prior experience in the role) become head coaches in the past decade. The three they fired were all first-time coordinators. The initial list for Patullo’s potential replacements included Mike McDaniel and Brian Daboll. The notion of a (then-)33-year-old quarterbacks coach who had never called plays would have seemed far-fetched.As the search evolved, the Eagles broadened the pool — and softened the desire for play-calling experience. Sirianni interviewed 17 candidates, with seven returning for a second interview. Mannion, who conducted a virtual interview while coaching the East-West Shrine Game, won the Eagles over with his vision for the offense. Sirianni had become intrigued by the offensive system utilized by the Sean McVay/Kyle Shanahan tree — a scheme in which Mannion both played in and coached. He also had his own ideas and background as the son of a high school coach who starred for Mike Riley at Oregon State and caddied for quarterbacks such as Kirk Cousins and Jared Goff in the NFL.“There’s things I believe in and there’s things that schematically I have a background in, but ultimately it’s going to be a blend and it’s constantly going to evolve,” Mannion said. “It’s about maximizing things for the players. How do we make the Eagles the best team we can be? How (do) we make the Eagles offense the best it can be and how do we put all of our players in a position to really, really succeed and maximize their strengths?”Philadelphia Eagles OC Sean Mannion (14) played nine year as a quarterback in the NFL before transitioning to coaching. Matt Krohn / USA TodayThe term “blend” was one Mannion used multiple times on Thursday, an indication that he’s open to tailoring the offense to the personnel he’s inheriting — a group that won the Super Bowl two seasons ago. Jalen Hurts’ acclimation to the offense matters most. Adjusting to a new play caller is a rite of spring for Hurts, who has entered every season since he enrolled in college in 2016 with a different play-caller than the start of the previous season. Mannion’s scheme is expected to include concepts that are different from what the Eagles have used for most of Hurts’ career, including more under-center plays and under-center play-action, specifically.Hurts, who has come under scrutiny this offseason for the offense’s regression last season, expressed excitement in March when discussing Mannion’s hire. Mannion started the relationship by trying to get to know Hurts “on a personal level,” learning Hurts’ interests and “what makes him tick.” The personal connection then translates to football — Mannion is only six years older than Hurts — and Mannion sounded bullish on how Hurts will function in his offense.“I really think he can do anything we ask of him,” Mannion said. “He’s accurate. He’s a great athlete. He really attacks the fundamentals. That’s what’s been really fun to watch these last two weeks of phase two. He’s always wanting more things to work on, wanting more things regarding fundamentals, timing, understanding the scheme. He’s hungry for more. Those are the guys that are really fun to work with. In terms of skill set, though, he has great arm strength, great accuracy, obviously a tremendous athlete and he really attacks the game. He has a great process in the meetings. He always asks really, really thought-provoking questions. He’s detailed and attacks his fundamentals.”Hurts rushed for 26.3 yards per game last season — a notable decline from his previous four seasons as a full-time starter — and Mannion said Hurts’ rushing ability “will be a part of it, but it won’t be the only part of it.”