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The Open Group Architecture Framework (TOGAF) is a framework - a detailed method and a set of supporting tools - for developing an enterprise architecture. It may be used freely by any organization wishing to develop an enterprise architecture for use within that organization (see Conditions of Use).
TOGAF was developed by members of The Open Group, working within the Architecture Forum (www.opengroup.org/architecture). The original development of TOGAF Version 1 in 1995 was based on the Technical Architecture Framework for Information Management (TAFIM), developed by the US Department of Defense (DoD). The DoD gave The Open Group explicit permission and encouragement to create TOGAF by building on the TAFIM, which itself was the result of many years of development effort and many millions of dollars of US Government investment.
Starting from this sound foundation, the members of The Open Group Architecture Forum have developed successive versions of TOGAF each year and published each one on The Open Group public web site.
If you are new to the field of enterprise architecture and/or TOGAF, you may find it worthwhile to read the set of Frequently Asked Questions (Frequently Asked Questions), where you will find answers to questions such as:
There are four main parts to the TOGAF document:
Downloads of the TOGAF documentation, including a printable PDF file, are available under license from the TOGAF information web
site (www.opengroup.org/architecture/togaf). The license is free to any
organization wishing to use TOGAF entirely for internal purposes (for example, to develop an Information System Systems Architecture for use within that organization).
The TOGAF documentation is freely available for viewing online without a license. Alternatively, the complete TOGAF documentation set may be downloaded and stored under license, as explained on the TOGAF information web site.
In either case, the TOGAF documentation may be used freely by any organization wishing to do so to develop an architecture for use within that organization. No part of it may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for any other purpose including, but not by way of limitation, any use for commercial gain, without the prior permission of the copyright owners.
A good definition of "enterprise" in this context is any collection of organizations that has a common set of goals and/or a single bottom line. In that sense, an enterprise can 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 systems, and a specific domain within the enterprise. In both cases, the architecture crosses multiple systems, and multiple functional groups within the enterprise.
Confusion also arises from the evolving nature of the term "enterprise". An extended enterprise nowadays frequently includes partners, suppliers, and customers. If the goal is to integrate an extended enterprise, then the enterprise comprises the partners, suppliers, and customers, as well as internal business units.
Large corporations and government agencies may comprise multiple enterprises, and hence there may well be separate enterprise architecture projects. However, there is often much in common about the information systems in each enterprise, and there is usually great potential for gain in the use of a common architecture framework. For example, a common framework can provide a basis for the development of an architecture repository for the integration and re-use of models, designs, and baseline data.
The definition of an architecture used in ANSI/IEEE Std 1471-2000 is:
"The fundamental organization of a system, embodied in its components, their relationships to each other and the environment, and the principles governing its design and evolution."
At the present time, TOGAF embraces but does not strictly adhere to ANSI/IEEE Std 1471-2000 terminology. In TOGAF, "architecture" has two meanings depending upon its contextual usage:
In TOGAF we endeavor to strike a balance between promoting the concepts and terminology of ANSI/IEEE Std 1471-2000 - ensuring that our usage of terms defined by ANSI/IEEE Std 1471-2000 is consistent with the standard - and retaining other commonly accepted terminology that is familiar to the majority of the TOGAF readership. For more on terminology, refer to Part IV: Resource Base , Developing Architecture Views .
An architecture description is a formal description of an information system, organized in a way that supports reasoning about the structural properties of the system. It defines the components or building blocks that make up the overall information system, and provides a plan from which products can be procured, and systems developed, that will work together to implement the overall system. It thus enables you to manage your overall IT investment in a way that meets the needs of your business.
An architecture framework is a tool which can be used for developing a broad range of different architectures. It should describe a method for designing an information system in terms of a set of building blocks, and for showing how the building blocks fit together. It should contain a set of tools and provide a common vocabulary. It should also include a list of recommended standards and compliant products that can be used to implement the building blocks.
The primary reason for developing an enterprise architecture is to support the business by providing the fundamental technology and process structure for an IT strategy. This in turn makes IT a responsive asset for a successful modern business strategy.
Today's CEOs know that the effective management and exploitation of information through IT is the key to business success, and the indispensable means to achieving competitive advantage. An enterprise architecture addresses this need, by providing a strategic context for the evolution of the IT system in response to the constantly changing needs of the business environment.
Furthermore, a good enterprise architecture enables you to achieve the right balance between IT efficiency and business innovation. It allows individual business units to innovate safely in their pursuit of competitive advantage. At the same time, it assures the needs of the organization for an integrated IT strategy, permitting the closest possible synergy across the extended enterprise.
The technical advantages that result from a good enterprise architecture bring important business benefits, which are clearly visible in the bottom line:
Using an architecture framework will speed up and simplify architecture development, ensure more complete coverage of the designed solution, and make certain that the architecture selected allows for future growth in response to the needs of the business.
Architecture design is a technically complex process, and the design of heterogeneous, multi-vendor architectures is particularly complex. TOGAF plays an important role in helping to "de-mystify" the architecture development process, enabling IT users to build genuinely open systems-based solutions to their business needs.
Those IT customers who do not invest in enterprise architecture typically find themselves pushed inexorably to single-supplier solutions in order to ensure an integrated solution. At that point, no matter how ostensibly "open" any single supplier's products may be in terms of adherence to standards, the customer will be unable to realize the potential benefits of truly heterogeneous, multi-vendor open systems.
Typically, an architecture is developed because key people have concerns that need to be addressed by the IT systems within the organization. Such people are commonly referred to as the "stakeholders" in the system. The role of the architect is to address these concerns, by identifying and refining the requirements that the stakeholders have, developing views of the architecture that show how the concerns and the requirements are going to be addressed, and by showing the trade-offs that are going to be made in reconciling the potentially conflicting concerns of different stakeholders.
Without the architecture, it is highly unlikely that all the concerns and requirements will be considered and met.
TOGAF is an architecture framework - The Open Group Architecture Framework. It enables you to design, evaluate, and build the right architecture for your organization.
The key to TOGAF is the Architecture Development Method (ADM) - a reliable, proven method for developing an IT enterprise architecture that meets the needs of your business.
There are four types of architecture that are commonly accepted as subsets of an overall enterprise architecture, all of which TOGAF is designed to support:
Any organization undertaking, or planning to undertake, the design and implementation of an enterprise architecture for the support of mission-critical business applications, using open systems building blocks.
Customers who design and implement enterprise architectures using TOGAF are ensured of a design and a procurement specification that will greatly facilitate open systems implementation, and will enable the benefits of open systems to accrue to their organizations with reduced risk.
TOGAF provides a common-sense, practical, prudent, and effective method of developing an enterprise architecture.
TOGAF consists of three main parts:
TOGAF is published by The Open Group on its public web site, and may be reproduced freely by any enterprise wishing to use it to develop an enterprise architecture for use within that enterprise.
Basically, information about the benefits and constraints of the existing implementation, together with requirements for change, are combined using the methods described in the TOGAF ADM, resulting in a "Target Architecture" or set of Target Architectures.
The SIB provides a database of open industry standards that can be used to define the particular services and components required in the products purchased to implement the developed architecture. The SIB provides a simple and highly effective way to procure against an enterprise architecture.
The Open Group operates as a not-for-profit consortium committed to delivering greater business efficiency by bringing together buyers and suppliers of information systems to lower the barriers of integrating new technology across the enterprise. Its goal is to realize the vision of Boundaryless Information Flow.
TOGAF is a key part of its strategy for achieving this goal, and The Open Group wants TOGAF to be taken up and used in practical architecture projects, and the experience from its use fed back to help improve it.
The Open Group therefore publishes TOGAF on its public web server, and allows and encourages its reproduction and use free-of-charge by any organization wishing to use it internally to develop an enterprise architecture. (There are restrictions on its commercial exploitation, however; see Conditions of Use).
Organizations wishing to reduce the time, cost, and risk of implementing multi-vendor solutions that integrate within and between enterprises need The Open Group as their key partner.
The Open Group brings together the buyers and suppliers of information systems worldwide, and enables them to work together, both to ensure that IT solutions meet the needs of customers, and to make it easier to integrate IT across the enterprise.
The Open Group Architecture Framework is a key enabler in this task.
Yes, TOGAF itself is freely available. But how much will you spend on developing or updating your enterprise architecture using TOGAF? And how much will you spend on procurements based on that architecture?
The price of membership of The Open Group is insignificant in comparison with these amounts.
In addition to the general benefits of membership, as a member of The Open Group you will be eligible to participate in The Open Group Architecture Forum, which is the development program within which TOGAF is evolved, and in which TOGAF users come together to exchange information and feedback.
Members of the Architecture Forum gain:
The TOGAF document set is designed for use with frames. To navigate around the document:
Downloads of the TOGAF documentation, are available under license from the TOGAF information web site . The license is free to any organization wishing to use TOGAF entirely for internal purposes (for example, to develop an information system architecture for use within that organization). A hardcopy book is also available from The Open Group Bookstore as document G063 .