One of my sisters worked as a secretary in a small management consultant office when I was still in my later teens. She would tell me about the types that her office used (which I now realize were based on MBTI, but given names to make them easier for their clients to understand). I found it interesting, but didn't get that into it. Eventually, sis gave me Keirsey's PUM, which I started to read, but found I wasn't interested in. Then, one of the marriage counselors my ex and I went to had us both take an MBTI test. I came out INTJ. But she didn't go into any explanations and I didn't connect the test to Keirsey or the management consultant types. Then my sis gave me PUMII when it came out in the late 90s. I finally was interested, but didn't go any further into it than Keirsey. At that time, I decided I was some mix of INFJ and INTJ. I ended up looking for online groups, but didn't find one that suited until I came here. Now I have all this other stuff to learn about--functions, enneagram, etc.