A clear guide to the 16 Myers-Briggs types: the four letter pairs, the Analyst, Diplomat, Sentinel and Explorer groups, and each type's strengths and weaknesses.
What the -A and -T at the end of a personality type mean, where the fifth letter comes from, how it relates to the Big Five, and why neither result is better.
How Carl Jung's 1921 theory of attitudes and functions works, how it produces eight types, and what Myers and Briggs changed when they built the MBTI from it.
Signs your MBTI result may be wrong, the most common reasons people get mistyped, often-confused type pairs, and a step-by-step way to find your best-fit type.
What J and P mean in Myers-Briggs: planned versus flexible approaches to life, the function each letter points to, and why Judging has nothing to do with being judgmental.
How MBTI cognitive functions and stacks work, with a close look at Introverted Feeling (Fi) and Extraverted Intuition (Ne) and which types use each function.
What the S and N letters mean in Myers-Briggs: how Sensing and Intuition differ in taking in information, which types are which, and how to tell your own preference.
What the T and F letters mean in Myers-Briggs: how Thinking and Feeling types make decisions, common myths about both, and how to work out your own preference.
The five rarest MBTI types are usually given as INFJ, ENTJ, INTJ, ENFJ and ENTP. Why they're rare, where the numbers come from, and what rarity really means.
Jung's eight types explained: extraverted and introverted thinking, feeling, sensation and intuition, what each is like, and which MBTI types they correspond to.
What extraversion means in personality psychology: Jung's original idea, the Big Five trait, the MBTI's E, how it differs from confidence, and where ambiverts fit.
Intuitive types focus on patterns and possibilities; Observant types focus on concrete facts and the present. Why Observant is 16Personalities' word for Sensing.
Jung's No. 1 personality was his name for his everyday, outward-facing self, set against a timeless inner No. 2. What it meant, and what his own type was.