This approach should be scaled up or down depending on the size of the organization undertaking the transition. A software development department of 30 people may have an ETC of 5 people and nothing more. A company-wide transition for a department of 200 developers may have a 10-person ETC (including representatives from groups outside development) plus a handful of improvement communities at any time. Things can scale from there as needed; IBM, for example, has over 800 people in some of its improvement communities.
