Tactics Details

Player support:

So this basically this dictates how teammates move around the ball carrier, so it's correct in it's called player support, where it's confusing is offensive and defensive.

So values 0-6, what they do is make players provide options sideways and many backwards 'safe options' to the ball carrier. So with Barca for example, this is set to 0, so it makes Barca play a lot of safe, backwards, sideways passes, So overall it means, 'slow orientated build up'.
Values 7-13 (balanced) Just means teams will attack normally and player on the ball as standard look for options ahead of them unless the player isn't in clear space, teammates won't always run ahead of the ball carrier.
Values 14-20 means fast attacking, team mates always look to get ahead of the ball carrier and the team is encourages to look only for forward passes!
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Support Range

Support range shows how close the players stay to around the ball carrier

So values 0-6 mean the players keep close together, (Barcelona Arsenal) it's useful for short passing game, tiki takaetc..

7-13 is standard

14-20 means players spread away from the ball carrier, this is useful for teams that counter, and teams like Stoke etc.. for long balls, Long passing game hoofball etc..
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Position Switch

Position switch dictate how much freedom players have to temporarily play in different designated positions or switch places with players in similar positions.

0-6 means player rarley if ever switch positions (tactically disciplined)

7-13 means players will now and gain switch with players in asimilar position, so for example the left central midfielder and right central midfielder or two strikers will change the sides they are playing, same with centre backs even.

14-20 is similar to that above but If a player finds himself out of postion he will then take up the nearest position designated for a while, the drop back to his designated position. So for example i a center back charges forward, if he ends up in midfield he will stay there for a bit,t hen move back, same with striker coming back to defend. It's built to give you the option to give your players the choice to swap around a bit in bid to confuse the opposition and say if acenter back is getting the better of a striker, maybe swap for asecound with awinger and see if it confuses him.
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Attacking Style

Attacking style is quite important for player runs and general player movement when attacking.

0-6 means players will drift and congregate out in wide positions to support he ball carrier in making attacking moves out wide

7-13 (balanced) players will maintain their shape

14-20 players will congregate more in the middle, and wide men for example will come inside to offer support through the middle.
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Pressing

Pressing is both how intense your team presses the oppositions ball carrier and also i've noticed a zonal element to this.

0-6 (loose) makes players stand off the ball carrier and the player will focus much more and working with his teammates as a unit.

7-13 players, won't actively close down the opposition, they will tend to hod shape unless the opposing ball carrier enter is, well 'zone' (Zonal marking) Maybe.

14-20 tight players will actively close down the opposition, 14-20 dictates how intense they move out of their formations shape to meet the ball carrier
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Defensive Line

0-6 Deep

7-13 Normal

14-20 High
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Compactiviness

This dictates how closely compacted your team is when closing in around the ball carrier

0-6 The team forms up as a unit very tightly in the center of the pitch

7-13 Normal

14-20 The team spreads out around the ball carrier.

Finally you should now that: 0-6 and 14-20 dictate how extreme you want your team style to be for each parameter so 14 is say relatively far from the ball carrier and 20 is very far etc..

7-13 Dictates you wan a balance but with a slight favor towards a parameter. So 7 or 8 would mean your players your players would move slightly out wide, and say 11 12 would make them move slightly towards the middle etc..
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Source: http://forums.evo-web.co.uk/showthread.php?t=68909