This is just a summary from http://blogs.hbr.org/2012/08/why-less-is-more-in-teams/ . All credits goes to Mark De Ron for his great article.
On this Slide you will find why Performance Management is one of the most important thing for growing company. Teamwork is not automatically done, especially for self-managed team.
Mark's article help me a lot to understand about this phenomenon, i hope it will help you also.
Enjoy this simple slide. My first ever upload.