AI or Artificial intelligence is grown when players play matches. It goes from 0-100%.

The higher the AI is the bigger a boost a player gets to his 8 attributes. If AI is 100% his starting skills have grown about 25% from where they started at.

When a players AI reached 10% an extra slot to wear a player item is unlocked.

The first AI earned gives a larget boost than the last. E.g. will an AI at 11% boost the players attributes with 10% compared to starting skills, while an AI of of 50% will boost the attributes with around 20% and, as mentioned, an AI of 100% will boost the attributes with about 25%.

AI grows more in some matches. Here is how much it typically grow per 90 mins of a match type played*:

Champions League Match = 0.300%

Cup Match = 0.270%

League match = 0.240%

World Tour Match = 0.045%

Ladder Match = 0.009%

Friendly match = 0.003%

*values are without any boost to AI from staff nor club expertize.