Apparently,it's quite hard to score. The creators have written a 350 page manual to score it.
I've written a more simple test called the house test. It'll tell you all about a person in just one easy drawing.
Ask the subject to draw a house. If the subject is
|A Normal House|
If they turn up something like this, you've got a geek on your hands.
|A Linux Geek House|
|The House that Mac Built|