In fact, I already knew a bit my strengths.
If your friends and family know that you often tell, as they do for me, "Julien would like you who is good at doing that, you can take care of you?", It is then "you if you were doing this job you'd be very good. "
Then you already have your strengths, the test will give you exactly the same.
After the idea to work only on its strengths is interesting; although my wife would prefer that I work on my weaknesses ...
Also see the description of all the different characters (included in the book) can be used to better understand his surroundings in order to better satisfy him, or not ...
I would recommend this book to people who do not know each other at all or are in the process of change occupations and who read English.
PS: the test code is included in the book, then buy the new book if you want to take the test.