- existing current bad systems has evolved at one reasonable choice at a time - it was reasonable back then
- there are teams where everyone, when interviewed individually, points out the same problem, but no action is taken, because it's assumed that the others want it this way
- position based vs. value based proposals - the former prevents compromise, the later enables it (e.g.: I want to achieve this goal, and in the past I've used chef to get there. But note I'm interested in the result, not in using chef).