Discuss the value stream model with stakeholders of business units that are responsible for the major product categories.
Discuss the model with stakeholders of business units responsible for the major business processes (e.g. ‘Sales’, ‘Back Office’).
Discuss the model in groups of stakeholders of the same business unit; one business unit after the other.
When you have consensus within these groups, discuss it with the business unit leads in one-to-one meetings.