As orignally referred to by Jung and correctly understood the so called tertiary function is also an auxiliary function but I accept that in MBTI related publications that only the first auxiliary is referred to as such In Jung s Psychological Types both are referred to as auxiliary functions so it is not out of place in this article to clarify this difference in how the term is used My concern about using auxiliary to describe the tertiary function has nothing to do with its correctness with respect to Jung s writing In the context of this article I believe it does more to create confusion than to add value So for the sake of the reader I believe it s better left out And at any rate this article isn t about Jung except in terms of his influence on Katharine Briggs and Isabel Myers