sentences:  Driving point and transfer functions can generally be found using KVL and KCL methods, however several complicated equations may result that offer little insight into the circuit's behavior.Using the extra element theorem, a circuit element (such as a resistor) can be removed from a circuit and the desired driving point or transfer function found.By removing the element that most complicates the circuit (such as an element that creates feedback), the desired function can be easier to obtain.