Strategy system setup very important for successful traders

In forex market any trader need a strategy or setup or system to follow with rules to be successful why we need this to actually control our behavior and our discipline to follow these systems and to check again later if this system is making good profit or is not real good as you expected and you can tweak it and change it later on when you review your journal so any trader want to be professional you have to have some sort of system or setup to follow.