See for a position that requires a lot of problem solving in mathematics or statistics or something I might can understand...but something that deals more with physically performing a task I think doing that task during the interview should be the test.

Like for the plumbing have a mock toilet that's clogged or something (I'm not well versed in plumbing but I hope you get my point lol) and have the potential employee fix it...my thought is you'll find out more this way than you would reading the results of the test.

Next semester I have to present a paper about it and I'm not particularly looking forward to it. I found some websites that provide great information on it like CPP that companies can use and seeing the responses of employees that have had to take the test that aren't particularly fond of it...this is going to be a long paper.

@kapis does what you mentioned have a free evaluation available online or do you HAVE to purchase the book to do it?