I should probably mention, if anyone is thinking of paying the $9.95 for the
Dewey Color System Profile, consider buying this book and taking the test within it instead:
Amazon.com: StrengthsFinder 2.0: A New and Upgraded Edition of the Online Test from Gallup's Now, Discover Your Strengths: Tom Rath: Books
You can even get free 2-day shipping if you're an American and use the Amazon Prime trial that Amazon keeps trying to show me (as an Aussie, I don't qualify for Amazon Prime; darn).
StrengthsFinder will permanently change the way you look at life. It does require a fair bit of understanding before you figure out how to actually apply knowledge of your talents, but it's do-able. I'm improving at it, and am now at a point where I can consistently, holistically apply my talents and strengths effectively.
If it seems like I talk about StrengthsFinder often, that's just because it's ridiculously good and not many people realise it. Even those who've taken it don't realise it, heh (as I said, it takes a bit of understanding before the information becomes actionable; reaching that point is worth it).
Dewey colour systems: the bad news is that Gallup interviewed over 2 million people to get the result that is the StrengthsFinder 2.0 test. The good news is that with the right talents and strengths, you can create something that is equally as accurate with proper extrapolation and intelligent assumed truths. But it's probably best to leave Gallup to StrengthsFinder and pioneer forward in another area.