There are two posts on personality theory that I recommend you start off with. The first is an introduction to personality type theory and “the functional stack.” It explains, among other things, how we determine the four functions that make up each personality type’s functional stack. The second post, Rethinking Judging & Perceiving in IPs & IJs, builds on the first and seeks to clarify some of the confusion relating to Judging and Perceiving in introverted types.
I. The Eight Functions
It is also important for any student of typology to understand the difference between the preferences (E, I, S, N, T, F, J, P) and the functions (see below). For the most thorough and accurate understanding of your personality type, I generally recommend focusing on understanding the functions and the role they play in your type’s functional stack.