Other than communication, SFI's most important tool is the one that works best for you.
I suppose other than that it is not really a tool but it is what SFI survives on, and that is DUPLICATION.
One of the main reasons SFI is so successful is because we all duplicate what our leaders do, (or at least the more successful ones do).
Everybody is different and they approach the same thing in many different ways. When you find something that works well for the way you do things you keep on using it. If your upline or a member of your downline attempts to do the same thing it a slightly different way they may not get the same results as you.