INTJ or INFJ Test Based on the Work of Myers, Briggs, and Jung. So you've taken the basic Personality Type Test and you're still not sure of your type. But you've had a peek at the system and you think that you're probably INTJ or INFJ. Don't worry. This happens to a lot of people when they're first getting into psychological type.

Take the INFJ or INTJ Test Now! Many INFJs and INTJs relate to some aspects of both feeling and thinking. That’s because the auxiliary and tertiary functions of both INTJs and INFJs are either Thinking/Feeling or Feeling/Thinking respectively.

INFJs use Fe, INTJs use Te. Though both of these types have Ni as their dominant function, INFJs have Extraverted Feeling (Fe) as their auxiliary function, whereas INTJs operate with Extraverted Thinking (Te). The auxiliary function is like a sidekick to the dominant function, helping the dominant function on its way.

It wasn’t until many years later that I took another test and got INFJ — a result that really fit. Not sure if you’re an INFJ or INTJ? Here are five ways to tell them apart.