Published Patterns - Scrumming the Scrum
you are using Scrum as a process improvement. The Scrum Team must have effective Sprint Retrospectives and be willing to Pop the Happy Bubble. The basic Scrum mechanisms are in place, and you want to leverage Scrum to fulfill its vision of kaizen (see also Kaizen and Kaikaku): kai-zen (カイゼン) n.
https://sites.google.com/a/scrumplop.org/published-patterns/retrospective-pattern-language/scrumming-the-scrum
