The idea we're trying to implement is that the team of smart, intelligent people can naturally allocate their own time resources. That's why the responsibility for completing challenges is diffused between various team members. If somebody has more time, because they have finished all their "standard tasks" already, they can meanwhile complete a challenge. (We try to keep our challenges small to keep up the momentum.)
The process is still a work in progress, though. We're still to learn what the long term consequences will be. But we're more than willing to experiment.
