Serco is a global company that provides outsourcing services across multiple industries and geographies. It has over 120,000 employees and annual revenue of over £4 billion. The document discusses Serco's approach to mobilizing a global enterprise architecture in a digital world, including establishing an IT operating model, principles, governance, reference architectures, standards and guidance, metrics and measures, and an enterprise architecture portal. It provides tips for implementing an effective enterprise architecture, emphasizing communication, integration with the business, and establishing a collaborative approach.