Culture is about the hardest thing to change in any organisation, and I have seen many so called “culture change” initiatives fail at the first hurdle.
If culture really is, as Michael Porter put it many years ago “the way things are done around here” and I believe it is, then it follows that in order to change culture, you must change behavior. The only way to change behaviour in a manner that it becomes a sustainable change, is bit by bit, accompanied by good reasons for the individual to change behavior, encouragement and rewards for changing (acknowledgement, not money) and the stories of success.
Sounds like the manufacturing “continuous improvement” or Kaizen process applied to culture change, and that is exactly what it is.