It's become a business imperative to maximize operational effectiveness, trim costs, standardize and streamline processes, achieve economies of scale and increase competitive advantage. Today's most successful leaders do this in a way that balances the greater good of the enterprise with the competing demands of their autonomous businesses that must respond to the individual needs of their markets. A more collaborative model that helps leaders of complex businesses to maximize effectiveness is gaining traction. Four prominent business leaders discuss their challenges and successes in shifting to this shared business model.