This book endeavours to help further lift the discipline of EA by providing a reference architecture for an EA function and taking an EA approach to its documentation and analysis to help demonstrate, explain and rationalize EA and the EA function. In doing so outlining the key drivers and components of an EA function, including the influences on and objectives of EA, and the business and technology processes and resources required and used to address these. Keeping on point and avoiding being pushed into related but non-EA activities; buying time to do things properly while still being responsive and agile to changes in enterprise drivers; fitting into the organisation’s governance structure; building a capability not just delivering a series of non-repeatable, point-sensitive EA services are just some of the many challenges facing Enterprise Architects today. While there are a number of useful and informative EA frameworks and books available guiding organisations on what EA should deliver, organisations and individuals are left without the one thing they espouse for the enterprise at large, a target architecture for the EA function that can be used to best align it to their enterprise and allow them to plan and oversee its formation and change effectively. This leaves many decisions to be made in the absence of sound, communicable, measurable and transparent views as to why and what to strive for in doing EA. As a reference architecture typically describes a complete target architecture, and a complete architecture can take a long time to develop and fine tune, more than can be expected within a single release, project or time frame that initial outcomes are required by EA stakeholders and customers, the book takes a look at the different capabilities or themes that might be focused on to allow for the different needs and expectations enterprises have from EA. To ensure the reference architecture incorporates best practices in EA, it is built on the concepts and principles of EA outlined in Dr Scott Bernard’s book, An Introduction to Enterprise Architecture, EA3, and his EA training program and certification courses. Both of which in turn build on the EA experiences and practices of EA practitioners over near to three decades.