[nootScadoot]

I think this system is built on equal parts reliability and time management.

It becomes less of "Get this thing done by today" and more of "Get these 5 things done by the end of the week".

One developer might just leave it to the last minute or perhaps fail to deliver if they underestimate the scope of work, failing to deliver makes him more unreliable and shows he has a poor grasp on time management and needs day to day focus.

Another Developer may be more conservative with how much time they have available, but may still be working on a different wavelength in terms of day to day expectations, however at the end of the week, they deliver on time. This makes him more reliable and show that he has a good grasp on time management so far, so it shows that less day to day focus is needed on him.