I have to disagree though Igneos.
In my tactic I wanted my full backs to be primarily defensive but really help going forward and attack as a team, with them on a support duty, they very rarely got close enough to the box area to throw in a decent cross, they would always cross from deep even if they had space in front of them to go into and produce a much easier and more deadly cross as it gave time for more players to get into the box. Now they are on an attack duty they will attack that space, and hit that cross but as soon as I lose possession, they will track back quickly, while my DLP is protecting my backline just in case a CB has to go to stop them. While at the same time my Attacking 3 are putting pressure on the defence to try to force them to go long, when they do, my DLP who is a very defensive midfielder normally wins the long ball and it puts us back on the attack. Everything WJ has helped me vastly as it has put it into a simpler term, I have read all of those guides but I found it never quite worked for me unless I got lucky like in my first season, but when I was watching it, I never really understood the full reasons as to why things were going wrong, unlike now where I know the full reasons of where certain things were going wrong.
I've always watched extended highlights to try to understand it but some times I just couldn't put my finger on it, while now I can and the fact since the tactic started I lost by 1 goal to Man U, Man C and Arsenal, then followed it up with 3 convincing wins and 1 not so convincing win, it shows the tactic is working and exploiting the opposition in a way I want it to.
My DLP is starting the attack from deep in his own half, looking to feed either the AP, B2B, FB's or AM's, if he gives it to my B2B he quickly passes the ball and then is on the move for space in the attacking half which is what I want him to do, my B2B player is equally adapt at playing as the AP, but I don't want to double up on roles in the middle, as a B2B he is quicker to get back and help the DLP and defence than I found he was as a CM and he is also support my attackers, putting the short passing instruction on him just made him do everything a little quicker as he was looking for a simpler pass rather than holding onto the ball longer as he tried to pick a potential direct pass, leaving that decision to my AP who is more risky with the ball.
I don't see why people always say you must have certain roles with certain playing styles, as I've seen from so many other tactics, that is not the case at all at times. Yes some people make tactics which work and others they don't, I have so many times, but when they didn't work, I didn't want to always blame my side and I think now I was right not too, you can fine tune them and fix the issues to make it work how you see it. Every highlight now my team and disciplined at the times I want them too, but they are using the ball how I hope, the only critisiscm of it now is that I find my Inside Forwards sometimes hold on to the ball a bit longer than I would wish but I need them to sometimes to get more players into my attack. But my whole side is playing a lot more how I want them to in my eyes of how I'd like football to be played. You don't have to play like Arsenal when passing the ball short and keeping the ball and playing slowly, that was just how they play with the ball, look how fast Spain played in their best games, they kept the ball but the pace was by no means slow as they used to get teams chasing them like headless chickens. Football is a sport where many tactics can work and fail, Spains tactic worked brilliantly for 6 years then at the next World Cup it failed miserably and I think more people should give Football Manager credit for how they replicate it. As I had a tactic before which caught everyone off guard, mainly because it was so gung ho, but the following season teams really saw the problems my side had and were winning if they got their tactics right. Now though I can see how to fix those issues by adjust the shape of the formation and not lose the attacking way that formation had.