In the past few articles, I've been covering the problems that can arise when evaluating (and that Carlos Bana e Costa fixed with his MACBETH) so you may want to start from there:
- Dangerous mistakes when evaluating: election methods
- Influencing results: just participate!
- Weights do influence, big time
- Beware of scales
These articles are not about the MACBETH but about the problems it solves and how to work around them.