360-degree feedback

http://en.wikipedia.org/wiki/360-degree_feedback
What it Can / Cannot
http://www.custominsight.com/360-degree-feedback/what-is-360-degree-feedback.asp
About
http://humanresources.about.com/od/360feedback/a/360feedback.htm
Book
http://www.ccl.org/leadership/pdf/research/using360feedback.pdf
Resources
http://www.appraisal360.co.uk/resources/
Tube
https://www.youtube.com/results?search_query=360+feedback+system
Images
https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=643&q=360º+feedback+system