The MBTI is pretty much nonsense, sciencey snake oil. As is well-established by research, it has no more reliability and validity than a good Tarot card reading. To fully appreciate the mystery of its popularity one has to appreciate what a nonsensical procedure the MBTI really is.

Why is the Myers-Briggs Type Indicator (MBTI) so popular? It offers only positive descriptions of individuals. It offers individuals seemingly rich and intriguing descriptions of themselves. It has strong psychometric properties.

The INFJ is thought to be the rarest Myers-Briggs personality type, making up only 1-3 percent of the population. “INFJ” is an initialism that stands for Introversion (I), Intuition (N), Feeling (F), and Judgment (J), which describes the INFJ’s core characteristics.

Some research suggests the MBTI is unreliable because the same person can get different results when retaking the test. “This is a shortcoming, because people don’t fall neatly into two categories on any personality dimension; instead, people have many different degrees of the dimension,” Ashton told Live Science.

Effective counselors fit the INFJ (Introvertive, iNtuitive, Feeling, Judging) personality type that includes a combination of rare qualities.

The Myers-Briggs Type Indicator is one of the most popular personality tests in the world. The company’s website boasts the assessment has a 90% accuracy rating and a 90% average test-retest correlation, “making it one of the most reliable and accurate personality assessments available.”

Is 16personalities.com accurate? The test is reasonably accurate. Of course, very few people fit neatly into just one of the 16 boxes, some more than others.

The goal of the MBTI is to allow respondents to further explore and understand their own personalities including their likes, dislikes, strengths, weaknesses, possible career preferences, and compatibility with other people. No one personality type is “best” or “better” than another.