The success of the open source software movement is the single most dramatic example of how an opt-in engagement model can mobilize human effort on a grand scale… It’s little wonder that the success of open source has left a lot of senior executives slack-jawed. After all, it’s tough for managers to understand a production process that doesn’t rely on managers.

Gary Hamel: Open source is one of the greatest management innovations of the 21st century | opensource.com