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Enterprise architecture (EA) is both a function and a model In terms of a function, the establishment of an enterprise architecture consists of activities to ensure that important business needs are met by IT systems EA may also involve the construction of a
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2: IT Governance and Risk Management
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model that is used to map business functions into the IT environment and IT systems in increasing levels of detail
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The Zachman Model
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The Zachman enterprise architecture framework, established in the late 1980s, continues to be the dominant EA standard today Zachman likens IT enterprise architecture to the construction and maintenance of an office building: at a high (abstract, not number of floors) level, the office building performs functions such as containing office space As we look into increasing levels of detail in the building, we encounter various trades (steel, concrete, drywall, electrical, plumbing, telephone, fire control, elevators, and so on), each of which has its own specifications, standards, regulations, construction and maintenance methods, and so on In the Zachman model, IT systems and environments are described at a high, functional level, and then in increasing detail, encompassing systems, databases, applications, networks, and so on The Zachman framework is illustrated in Table 2-1 While the Zachman model allows an organization to peer into cross-sections of an IT environment that supports business processes, the model does not convey the relationships between IT systems Data flow diagrams are used instead to depict information flows
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Data flow diagrams (DFDs) are frequently used to illustrate the flow of information between IT applications Like the Zachman model, a DFD can begin as a high-level diagram, where the labels of information flows are expressed in business terms Written specifications about each flow can accompany the DFD; these specifications would describe the flow in increasing levels of detail, all the way to field lengths and communication protocol settings
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Data Scope List of data sets important in the business Conceptual data / object model Logical data model Physical data / class model Data definition Usable data Functional (Application) List of business processes Network (Technology) List of business locations People (Organization) List of organizations Time List of events Strategy List of business goals and strategy Business plan Business rule model Rule design Rule speculation Working strategy
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Enterprise Model Systems Model
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Business process model System architecture Technology design Program Working function
Business logistics Detailed system architecture Technology architecture Network architecture Usable network
Workflow
Master schedule Processing structure Control structure Time definition Implemented schedule
Human interface architecture Presentation architecture Security architecture Functioning organization
Technology Model Detailed Representation Function Enterprise
Table 2-1
Zachman Framework Shows IT Systems in Increasing Levels of Detail
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Figure 2-1 Typical data flow diagram (DFD) shows relationship between IT applications
Similar to Zachman, DFDs permit nontechnical business executives to easily understand the various IT applications and the relationships between them A typical DFD is shown in Figure 2-1
IT Strategic Planning
In a methodical and organized way, a good strategic planning process answers the question of what to do, often in a way that takes longer to answer than it does to ask While IT organizations require personnel who perform the day-to-day work of supporting systems and applications, some IT personnel need to spend at least a part of their time developing plans for what the IT organization will be doing two, three, or more years in the future Strategic planning needs to be a part of a formal planning process, not an ad hoc, chaotic activity Specific roles and responsibilities for planning need to be established, and those individuals must carry out planning roles as they would any other responsibility A part of the struggle with the process of planning stems from the fact that strategic planning is partly a creative endeavor that includes analysis of reliable information about future technologies and practices, as well as long-term strategic plans for the organization itself In a nutshell, the key question is, In five years, when the organization will be performing specific activities in a particular manner, how will IT systems support those activities But it s more than just understanding how IT will support future business activities Innovations in IT may help to shape what activities will take place, or at least how they will take place On a more down-to-earth level, IT strategic planning is about the ability to provide the capacity for IT services that will match the levels of business that the
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