Each player has 8 attributes. These are converted into 3 simpler qualities (DEF/MID/ATT) - (1 for GKs).

Robustness (Rob)
Players use their robustness in order to gain access to the ball in all sorts of situations on both offence and defense. robustness is particularly important when players attempt to head the ball.
It is also an important skill for brutal personality players when trying to do harm on the opponent as well as targets of brutality can use a little robustness to avoid being hit by this.

Vision (Vis)
Vision is the player's ability to be in the right place in the right time, as well as his ability to get the tactics right. It is an important skill for all players, especially midfielders.

Resilience (Res)
A player's resilience shows how good his physical condition is and how good he is at taken damaging hits during a match. Players with a low resilience tires very quickly, while players with a high resilience can play ninety minutes at a very constant level. resilience is an VERY important skill for all players.
Resilience is also key for not taking a big loss in condition when being hit by on-pitch violence.

Speed (Spe)
Speed shows you how well a player accelerates, and how fast he can run. Speed is used for most attacking and defending issues, but especially wingers and full backs duel using speed as a main factor. Forwards and central defenders are also very likely to need an at least passable speed, and will profit from a good one.

Tackling (Tac)
Players use their tackling abilities when they try to win the ball with a tackle. Both defenders and midfielders can use good tackling abilities - but it is the most important skill for a defender.

Technique (Tec)
Players with a good technique dribble well and have good ball control. Technique is also a factor when players pass or cross the ball and shoot. Both central midfielders, wingers and forwards need technique. Especially the midfielders.
Good technique will help your team keep the ball, and give you a better chance of controlling the play.

Heading (Hea)
When players head the ball, the power and precision of their headers are controlled by the heading skill. Forwards use heading to try and score goals, defenders to prevent the forwards from scoring and midfielders use it to gain control of the ball in midfield.

Shooting (Sho)
Shooting shows how well your players shoot the ball. Players with lots of shooting will be more effective as forwards. Midfielders can also benefit tremendously from good shooting skills.
For long shots players also use a little bit of technique and robustness on top of their shooting skill to fire the long range drives.

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Goalkeepers

Your keepers perform two tasks: First and foremost they struggle to keep your sheet clean by making saves on the three different types of finish (headers, regular/close finishes and ranged drives), but when the opportunity is there they may attempt to start something dangerous with a long throw or kick, using their distribution skill.

Robustness (Rob)
Goalkeeper use their Robustness in order to gain access to the ball mainly for crosses.

Vision (Vis)
Keepers with good Vision abilities are able to start dangerous counter attacks.

Resilience (Res)
A keeper’s resilience shows how good his physical condition is. Keepers with a low resilience tires a bit, while players with a high resilience can play ninety minutes at a very constant level. Resilience is an important skill for all players, and for keepers it can mean that he makes that vital save instead of conceding a goal.

Speed (Spe)
Speed shows you how well a keeper accelerates, and how fast he can run. Speed is used for the keeper mainly to get the right position to make a save and in one-on-ones.

Handling (Han)
One of the most important skills for goalkeepers in Futuball is handling. Handling is your goalkeepers' ability to hang on to the ball and deflect shots to safe places. A goalkeeper with good handling doesn't give away many rebounds.

One-on-ones (One)
The one-on-ones skill shows you how well your goalkeepers handle one-on-one situations with the opposing team's forwards; How much can he stress the attacker, and how well does he parry the finish. It is a medium important keeper skill.

Reflexes (Ref)
Reflexes is the second major goalkeeping skill. A keeper with superb reflexes parries a lot more close-up finishes like headers and one-on-ones, and he has a better chance of saving the ball in the first place than a keeper with poor reflexes.

Arial Ability (Ari)
If you keeper has good aerial ability he is good at picking out crosses and set pieces before they get too close to his goal line. A medium important skill.