Note: for purposes of this explanation I will be treating the functions as selected attitudes. In my view, the functions are essentially "selves" that we choose to use to deal with specific information, with the caveat of being limited by that "self's" ability to understand the information it perceives.
A function's most obvious limitation is in its capacity to resolve arguments by offering suitable ideas for filling in the gap between two opposing sides.
Strong functions: have full command of information
Weak functions: have limited command of information
Outer circuit strong functions: look for common ground, and are confident they can find it.
Outer circuit weak functions: use the example of strong functions if available, otherwise agree to disagree.
Inner circuit strong functions: probe for weaknesses in the opposition's argument, trying to identify circumstances wherein the opposition's argument does not hold. These functions concentrate on persuading and debate.
Inner circuit weak functions: try to justify the condemnation of the opposition's argument. They are functions of war.