I disagree it isn't scientific. It based on years of researchers by psychologists including Carl Jung.
Curlew... Would be interested to see tht link
You don't have to go through a list of questions to determine our type. I did mine answering four questions.
Describe your ideal working environment
Describe this photo (shown a photo)
What would be your reaction if you were driving down a road one night and came across a deer that had been hit by a car but was still alive?
When you have to go on a journey somewhere unfamiliar, do you prepare in anyway?
The answers to those 4 questions gave me the same type as the big list of questions approach... So greenfolder I see what you're saying, but not sure it can be explained away quite that simply.