I have found a couple of articles here on PC that are relevant. Interestingly, I couldn't find these using only the on-site search facilities. It was only a Google search that brought them to light.

One is a book review about an interesting-sounding book:

http://psychcentral.com/lib/2010/cha...hange-success/

The other is an essay:

http://psychcentral.com/lib/2011/is-...abit-worth-it/

Take care!