Parts 1 and 2 are also great reads, as they go into the relationship between the changer and the waiters.

It's especially challenging to communicate effectively when the waiter is not a developer. The language of structure vs. behavior is an excellent way to describe the challenges of building a system to a waiter, especially when frustration with a slow perceived pace of behavior change is coupled with a lack of understanding of needed structure. This vocabulary is universal and clearly conveys what is happening- thanks Kent!