What's the link between Business Architecture and Enterprise Architecture?

Most people say BA is part of EA (recent discussion on Linkedin). Is one included in of the other? or they overlap? Explain what you think.

Opened by Anonymous , May 22, 2012.

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Samuel Waissman International IT Director, Enterprise Architect, Healthcare Services
Jan 7, 2013

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Enterprise Architecture is the discipline. It is the sum of all the architecture components that enables the Business strategy. "The structure of components, their inter-relationships, and the principles and guidelines governing their design and evolution over time" ("TOGAF 9", The Open Group, VHP, pp. 9).

According to TOGAF, and generally accepted, there are 4 architecture domains:

1. Business architecture - deals with business strategy, governance, key business processes
2. Data architecture - deals with structure and organization of the data assets
3. Application architecture - deals with individual systems and interactions
4. Technology architecture - deals with software and hardware capabilities

Based on the source you look at, the domains and their scope may be slightly different.

In short, Business Architecture is a sub domain of the Enterprise Architecture and the link between the two are the Business strategies, governance models and key processes.
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Antoine Fournier Head of ECM, Input and Output management, Zurich Insurance
May 23, 2012

You may consider that a proper Business architecture is to be realized as a pre-requisite of an Enterprise architecture.
So, I would not say that BA is part of EA, but it can be considered as EA step 1.
In fact, BA is to define what's the target of an EA, right ?
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