For a bit more info about the "16 Types" ESTP etc have a look at
http://www.knowyourtype.com/mbti.html
If you are really keen you could even buy their assessment (US$100).
The QF practice leaflet has SHL Group at the bottom of it, you can check them out at
http://www.shl.com.
Hate to think what sort of questions would be asked if these tests were based not on Carl Jung's work, but Sigmund Freud's...
