In the front seat you have the Driver. This is the most developed function of your personality. You spend most of your time here naturally because it puts you into flow.
Next, there's the Co-Pilot. This is your second strongest function which supports your Driver and is very important for you to develop to achieve growth.
Behind this, there's the 10 Year Old. This function shows up with the maturity of a 10 Year old. While important, without working on it this can become your go-to Defensive Position.
Finally, there's the 3 Year Old. This is your least mature function. Its influence over you is unconscious and yet is often the source of your life's aspiration.