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The Zachman framework provides a means of classifying an organisation’s architecture.
It is a proactive business tool, which can be used to model an organisation’s existing functions,
elements and processes – and help manage business change. The framework draws on Zachman’s
experience of how change is managed in complex products such as aeroplanes and buildings.
TOGAF
The TOGAF (The Open Architecture Framework) is a METHODOLOGY and a Framework. It is more
recent than Zachman.
TOGAF defines ;enterprise; as any collection of organizations that has a common set of goals. For
example, an enterprise could be a government agency, a whole corporation, a division of a
corporation, a single department, or a chain of geographically distant organizations linked together by
common ownership. The term ;enterprise; in the context of ;enterprise architecture; can be used to
denote both an entire enterprise – encompassing all of its information and technology services,
processes, and infrastructure – and a specific domain within the enterprise. In both cases, the
architecture crosses multiple systems, and multiple functional groups within the enterprise
GARTNER
It is a discipline for proactively and holistically leading enterprise responses to disruptive
forces by identifying and analyzing the execution of change toward desired business
vision and outcomes. EA delivers value by presenting business and IT leaders with
signature-ready recommendations for adjusting policies and projects to achieve target
business outcomes that capitalize on relevant business disruptions.

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