As a swede. This is the first time I've seen this 4 colour system. I'm 30, so maybe it's more popular around younger people? I have seen things like "INTP-J" on friends profile. I think it's called 16 personalities. Me and my colleagues did that test, and the suggested one for me did not fit in with me at all, and most of us thought the results were bullshit. Why anyone would follow this to make work groups, or to ex…
The INTP thing is MBTI type, and although it's widely derided, it's pretty strongly correlated with the much more respectable Big Five personality traits[0]. It's not 100% bullshit, since knowing it tells you a little bit about how someone will act. I do agree that cutting someone out of your life solely due to a personality test is putting the cart before the horse, regardless of how scientifically rigorous it is. […
Well, two of the MBTI types have a strong correlation (defined typically as >0.5, in the MBTI case around 0.7 in both cases, IIRC) with two of the Big 5 traits. But that’s...not so great a reason to lean on MBTI.