Holland Code Assessment can be used as a way to help individuals identify what they like to do in their job and what kind of environment would be best suited for them when doing career exploration.
I typically do this one on one with clients using a Peak and Valley exercise whereby I ask the client to tell me what they like the most or least about each of their jobs. We then look at all the "peaks" or highs of what they like and that generally gives me a pretty good idea of potential career paths that I can recommend for them to investigate.
The Holland Code model does the same thing in a more scientific way and certainly has more resources attached to it, as you can take someone's Holland Code and start to match up potential career paths using the National Occupany Chart or NOC listing of careers.
Check out the following link for a free Holland Code Assessment that you can use with your client groups when doing career counselling.
http://www.roguecc.edu/Counseling/HollandCodes/test.asp
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