9. Phase C: Information Systems Architectures

Chapter Contents
9.1 Objectives | 9.2 Approach | 9.3 Inputs | 9.4 Steps | 9.5 Outputs

This chapter describes the Information Systems Architectures for an architecture project, including the development of Data and Application Architectures.

Requirements Management Phase H Phase G Phase F Phase E Phase D Phase C Phase B Phase A Preliminary Phase
Figure 9-1: Phase C: Information Systems Architectures

9.1 Objectives

The objectives of Phase C are to:

9.2 Approach

Phase C involves some combination of Data and Application Architecture, in either order. Advocates exist for both sequences. For example, Steven Spewak's Enterprise Architecture Planning (EAP) recommends a data-driven approach.

On the other hand, major applications systems - such as those for Enterprise Resource Planning (ERP), Customer Relationship Management (CRM), etc. - often provide a combination of technology infrastructure and business application logic, and some organizations take an application-driven approach, whereby they recognize certain key applications as forming the core underpinning of the mission-critical business processes, and take the implementation and integration of those core applications as the primary focus of architecture effort (the integration issues often constituting a major challenge).

9.3 Inputs

This section defines the inputs to Phase C.

9.3.1 Reference Materials External to the Enterprise

9.3.2 Non-Architectural Inputs

9.3.3 Architectural Inputs

9.4 Steps

Detailed steps for Phase C are given separately for each architecture domain:

9.5 Outputs

The main outputs of Phase C are:

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Downloads of TOGAF®, an Open Group Standard, are available under license from the TOGAF information web site. The license is free to any organization wishing to use the TOGAF standard entirely for internal purposes (for example, to develop an information system architecture for use within that organization). A book is also available (in hardcopy and pdf) from The Open Group Bookstore as document G116.