Moderate all around ... merp.
INTJ
Introvert(16%) iNtuitive(25%) Thinking(6%) Judging(22%)
You have slight preference of Introversion over Extraversion (16%)
You have moderate preference of Intuition over Sensing (25%)
You have slight preference of Thinking over Feeling (6%)
You have slight preference of Judging over Perceiving (22%)
I like the results of the JTT more than other temperament test because of the numerical percentages it provides, where most other tests just give you a binary feedback. I don't think the dichotomous values (I or E, N or S, etc.) are helpful if you're near the boundary; it might pigeon hole you in a group where you don't belong all the time.
Also, being a self-reporting survey, it's really only feeding back your preference, implying a person operates only under these conditions. In fact, it says nothing about what's good for you, only what you prefer. I prefer ice cream, but I don't/can't/shouldn't eat it all the time.
And it says nothing about my compatibility with other people, similar or different. True, I might communicate better with someone like me, but I might actually perform better working with someone who is complimentary rather than similar.
I've had a difficult time finding actual independent studies of the JTT's validity and reliability, beyond the information Humanmetrics provides, which, by the way, is provided without the source data, the details of the data collection, or even so much as the name of a human who did the study. They claim their validation study had a sample size of 1000 people. That's a very round number, and remarkably large compared to so many comparable validation studies. In fact, it's difficult to find a study with more than 300 people ... they exist, but they usually span many years and dozens of locations.
I'm not saying they made it up, but it would make me feel a lot better if I could get more details.
Most of my students who take the JTT survey are satisfied the results reflect their temperament, so I don't see why it would be difficult to show validity. And every time I've taken it, my results are nearly the same, and so reliability seems credible.
Opinions?