Here is an interesting piece of "scientific" evidence of some of manager-tools recommendation and statements that "we are not productive because we are happy. We are happy because we are productive."
Somethings to think about from Ted talk by Dan Ariely: What makes us feel good about our work?
"By getting people to work harder, they actually got people to love what they were doing to a higher degree."
"Ignoring the performance of people is almost as bad as shredding their efforts in front of their eyes."
I loved the talk. In my opinion, a must see for every manager.