Range of tolerance is a concept that differentiates between personal preference (what I really want to happen) and range of tolerance (what I am able to work with). What is outside of someone’s range of tolerance is what they will object to.
Too often, we get caught up in personal preferences. In order to be efficient and effective, we widen our options by not going for everyone’s preference but only for their range of tolerance. That way, we can find common ground more easily and do not get stuck.