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The Value Stream Manager
You may have already noticed that tracing the value stream for a product family will take you across organizational boundaries in your company. Because companies tend to be organized by departments and functions, instead of by the flow of value-creating steps for product families, you often find that Surprise -no one is responsible for the value perspective. no we have focused too heavily on process-level kaizen!) It is astoundingly rare to visit a facility and find one person who knows the entire material and information flow for a product (all processes and how each is scheduled). Yet without this, parts of the flow will be left to chance meaning that individual processing areas will operate in a way that is optimum from their perspective, not the value stream's perspective.
To get away from the isolated islands of functionality you need one person with lead responsibility for understanding a product family's value stream and improving it. We call this person a Value Stream Manager, and suggest that in this capacity they report to the top person at your site. This way they will have the power necessary to help change happen.