A system depends on the players you have. I played 4-3-3 with Ajax, 2-3-2-3 with Barcelona and a 4-4-2 with AZ. I'm flexible. The philosophy stays the same though. I don't think that you can adapt it to every possible situation. You need the right mindset, and it depends on how the players see the coach and vice versa. The coach is the focal point of the team but you need to have an open mind, and so do all the players. Everyone needs to work together to achieve a common goal.