In this presentation Kent Beck talks among other things, about a development technique called Keystoning. Someone from the audience asks him what it is. I didn’t know it either and that means someone else probably also doesn’t know. It’s really useful for bigger features and I have used it many times without even knowing it.
What is keystoning? Change the user-visible parts last. This way the changes seem to have come really fast for the user. You can change a lot of code, without making a change to the user inferface.