Give Ownership

When people are given ownership for only a piece of something larger, they tend to optimize that portion, limiting their thinking to this immediate domain. When people are given ownership of the whole, they stretch their thinking and challenge themselves to go beyond their scope.

Protecting that title

If people have a special title, they tend to do only things that seem a match for that title. And to protect the power of that role, they tend to hold on to specific knowledge.