Enterprise architecture addresses enterprise-wide issues for organizations with multiple systems, including cross-system concerns.
Your enterprise architecture model addresses both technical and business views.
Enterprise architects formulate, prove via code, document, and support the enterprise architecture model.
Enterprise architects develop and then support reference architectures, which show you how to implement aspects of the enterprise architecture.
Organizations that develop and support more than a handful of systems will benefit from taking an enterprise view of architecture. In the Enterprise Unified Process (EUP), an enterprise architecture includes the frameworks, networks, deployment ...