Book excerpt: What works, why it works, and how to evaluate a shared services program Shared services, a form of "internal outsourcing," enables corporations to achieve economies of scale by creating a separate entity within the company to perform specific internal services, such as payroll, accounts payable, travel and expense processing, etc. Essentials of Shared Services provides a quick, concise overview of shared services fundamentals, bringing senior-level executives up to speed so that they make the right decision. Bryan Bergeron provides a foundation of shared services from a historical, economic, technical, and customer perspective, showing how shared services can impact a corporation's bottom line, both long and short term. He delivers specific recommendations that can be used to establish and manage a shared services effort and includes a variety of examples of programs that work and those that do not.