Many lessons can be learnt from the approach that businesses have taken to the change process. Some of these businesses had to change to survive, so it took some strong leadership and bold plans. Others wanted to enter new markets or change their business model to address challenges. Change is inevitable for all businesses, with some being considered business as unusual, but others require a good change management program to be effective.

http://www.managers.org.uk/insights/news/2015/july/the-5-greatest-examples-of-change-management-in-business-history