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Enterprise architecture includes baseline architecture, target architecture, and a sequencing plan .
An EA is distinct from an EA framework, though the two are sometimes confused. A framework is a logical structure for classifying and organizing complex information. An Enterprise Architecture framework provides an organizing structure for the information contained in and describing an EA.
The framework does not contain the EA itself. Many organizations can use the same EA framework, but each EA with its content is organization-specific. Since Zachman introduced his framework  providing a deeper, more detailed understanding of the enterprise architecture, a number of other frameworks have been proposed.
Much more than just a list of IT standards to be followed by an enterprise, EA must cover the entire information system management process in order to provide a common basis for understanding and communicating how systems are structured to meet strategic objectives.
Fig 4. Enterprise architecture layers. This layer encompasses the application systems to be deployed, their interactions, and their relationships to the core business processes of the organization.
The main structural concept for the application layer is the application component. This concept is used to model any structural entity in the application layer: not just software components that can be part of one or more applications, but also complete software applications, sub-applications or information systems, such as the ERP modules, the SCM system, etc.
Each component can be associated to one or many process or sub-process belonging to the business layer hierarchy.
It covers the persistent data used and modified by applications. The Data Architecture is generally divided into two worlds: the Operational environment mainly constituted by business domains with production databases, and the Decisional environment with Datawarehouse, Datamarts, Data manipulation and migration tools, Data Analysis and Restitution applications.
Each data component is used by one or many application components to achieve one or many process goals. It describes the system software and hardware services necessary to run applications and store data for any type of business. Technology Architecture examines the underlying technologies that are required to run the organization.
It defines the components or building blocks that make up an overall information system, and provides a B. Enterprise Architecture Layers Although that no complete set of architecture description techniques, that fully enable and exploit integrated enterprise modeling, exist -, in the current practice of organizations, enterprise architectures is modeled as a layered organization.
The layers that are usually recognized in this context are the business layer, the application layer, the data layer and the technology IT layer Fig.
Building the business Architecture is the crucial step that is necessary to link business processes to the Strategic Intent of the International Journal of e-Education, e-Business, e-Management and e-Learning, Vol.
Process call of the principal composite component. Relationships between EA Layers While definition of each layer of an EA is an important first step in the EA development process, the true value of EA is found in the knowledge gained from the relationships among those layers.
Architecture links are defined to show the relationships and dependencies across and within architecture layers Fig. Relationships between EA layers. In this work, the definition of architecture links represents the second necessary step after defining all components of EA layers. The basic components e. Database, Operating system will be representing by a simple agents DRA.
The composite components e. In the next section, we generalize the principle applied for specifying and modeling of organizational systems to EA. So, we are going to follow the same steps for modeling an example of EA model. For thus, we should: 1 Specify the basic components DRA agents of each layer. The principal composite component that represents the overall EA; 3 Implement all specified components in the PAMS tool which will generate automatically the Business process Model according to the selected initial action e.
Information technology that has been built also inefficient according to company's vission and mission. Enterprise Architecture was built as a corporate master plan that became a reference or guidance in information technology development. Enterprise Architecture is an information technology company coming from the provision of needs and information embodied in form of application systems and provision of technology infrastructure.
Architectural overview provides important values for company where management can develop more effective strategies in monitoring business processes and technological infrastructure.
TOGAF provides detailed-methods of how to build, manage, and implement enterprise architecture and information systems called Architecture Development Method. This method contains some activities used in modeling the development of company's architecture. It is also a guide for planing, designing, developing, and implementing information systems architecture for organizations. The result of this design is an information technology architecture that becomes the guide for management in determining the budget of IT needs based on priority scale to support the efficiency of the company.
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