UEFA's executive table, but by the fans who will, or won't, turn up to games, and even by the players who may or may not resist the temptation to pull out of squads as they made a habit of for worldwide friendlies.
Firstly, group 1 will open with a game between Germany and France, the two last World Cup winners.
UEFA believes all its member federations are getting something they like.
Portugal will be Italy's second Nations League opponent on Sept 10.
In the middle of the traditional phase (June 2019), comes the final playoff for the Nations League.
Sport Bild reported last week that UEFA is set to launch a third club competition with 32 teams from 2021, and that the European Club Association (ECA) was one of the driving forces behind the reported changes.
At least one League D team - possibly Azerbaijan, Belarus or Luxembourg, for instance - will qualify for Euro 2020.
It might have been the heavyweight clash of UEFA's dreams to launch the inaugural Nations League competition, but as the rain poured down in Munich, Germany vs. France had all the edge of a friendly on a wet Thursday night.
"I think everything has been said about this".
England global and Leicester City defender Harry Maguire has admitted he and his teammates are confused by the upcoming UEFA Nations League, with the process of the competition proving hard to understand.
As well as that, each league will have a finals tournament in March 2020 that will be between the four group winners to determine who will be crowned league champions, with the winners of League A named Nations League champions.
The four group winners from League A advance to a Final Four to decide the Nations League champion.
Top 12 teams according to their Uefa coefficients are part of League A. Expect a single goal to separate the two top teams of world football. The remaining four places will be awarded to the winners of the mini-tournament mentioned above.
The other five Euro 2020 qualifying groups have six teams, using all the Federation Internationale de Football Association dates to play 10 games from next March through November.
The Africa Cup of Nations is moving to the summer and to a 24-team format. The four last-place teams in League A will be relegated to League B.
That means Federation Internationale de Football Association rankings will be drawn from progress and quality of opponent, not to mention the difference in gate receipts and the wider task of branding the global game or, such as in England's case, reconnecting the fans with the team.
The Euro 2020 draw will be in April, just a few weeks before the tournament begins in Rome.