7. Siemens AG, a $73 billion electronics and electrical engineering conglomerate, produces everything from light bulbs to x-ray machines, power-generation equipment, and high-speed trains. During its 156-year history, Siemens has become one of the world’s largest and most successful corporations. Siemens is well known for the technical brilliance of its engineers, but much of their knowledge used to be unavailable to other employees. Facing pressures to maximize the benefits of corporate membership of each business unit, Siemens AG needed to learn how to leverage the knowledge and expertise of its 460,000 employees worldwide.