Organization of enterprise and the Government agency & the self-governing community etc. (enterprise) inclusive describing architecture systematically with one method of a certain fixed thought, the present condition and the future image (the model) it is the activity which keeps advancing the entire optimum of organization by the fact that it visualizes. When methodology and the architecture model which support this activity are said, it is.

With EA, ranking all components of organization, it rearranges, keeps showing the interrelationship the. As for the object not only enterprise and also the administrative organ self-governing community and the like is included, as organization is possible to consider 1 section and the group of enterprise groups etc. inside enterprise. Goal and vision and business process model of organization, business rule, also information and information technology and the man-power resources etc. are included in the component.

As for the purpose of EA, as high-level decision making from the viewpoint of the entire optimum is supported by understanding the structure of the organization which has become complicated systematically, by the fact that standardization of business and the IT system etc. is advanced, there are times when it contributes to the improvement of efficiency of the management such as optimization of organizational structure and evasion of overlapping investment. Because of this, purpose and the mission of organization consistency of the IT system which is necessary in order to accomplish that is taken, the question ? callous which does effective IT investment is expected. In addition, present architecture (As Is) with the architecture which it should aim (To Be) from difference of both, it is connected with to also the question ? callous which does the planning of reform in order to keep bringing close organization to the proper form by the fact that it draws up.

Becoming the foundation of EA the John A rucksack man (John A. Zachman) in the dissertation "A Framework for Information Systems Architecture which" is announced to the IBM System Journal magazine was shown in 1987, it makesthe "rucksack manframework ".

As for the rucksack man framework because the one side where the general-purpose comprehensiveness is high, it is abstract, with the scene of practice more concrete framework is required, in the United States many frameworks are drawn up. As famous ones, for the American Government agency FEAF which is the EA framework (The Federal Enterprise Architecture Framework), TEAF of the American financial affairs ministry (Treasury Enterprise Architecture Framework), TOGAF of C4ISR Architecture of the Department of Defense Framework and Open Group (The Open Group Architecture Framework) and the like is known. In US the economic industrial ministry has presented the framework. In addition, IT consulting enterprise and the IT bender, offer the many framework from business process level to mounted level.