A few of my friends asked me to teach them about MBTI, and I am nervous about this because I'm definitely no expert, but apparently this doesn't bother them. I decided to go down the Cognitive Functions route because from anecdotes here, and from personal experience, online self-evaluation questionnaires more often than not prove inaccurate. The fact is that some of the current 'roles' for the functions have names which are kinda open to interpretation, which can make ordering them them difficult for novices to fully grasp.
So, I propose we basically list the functions, and think of words which come to mind when we contemplate them. What 'function' do they actually play, how do they affect our mindset? This way, longer descriptions can be sculpted in a way that everyone agrees with. It might be helpful to forget about the actual order of every one of our functions, and concentrate on each function in terms of how it sits in our personality.