In simple terms, it’s a chart showing a high level view of how often a player performs a specific action and how that ranks when compared to their peers.  The bigger the slice, the higher the player ranks.  A player in the 90th percentile for a category means they perform that action more than 90% of other players. The pizza chart is calculated at 5% intervals, and each concentric circle represents a 20th percentile.  It is based loosely on the above article from The Athletic, adapted to work with the metrics available within FM. I have analysed 26,000 players playing more than 900 minutes in the Top 20 domestic leagues, breaking down each metric by position.  Due to limitations this means the underlying data is static.  For example, an Attacking Midfielder who completes 4 dribbles per game will always be ranked in the 90th percentile, even if at that exact moment in your game world there may in fact more or less players better than them. The same metrics are used for each position (except goalkeepers) to enable you to understand the tactical profile of a player.  Forwards will be involved in a defensive capacity, and defenders will be involved in an attacking capacity, and understanding how a player compares in his position in all aspects of the game is important. Source: https://theathletic.com/2746113/2021/09/12/a-guide-to-smarterscout-and-understanding-the-athletics-pizza-charts/ (requires subscription)