Information Technology Reference
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possible needs, so methodologies are often layered at different operational
levels (as shown in Figure 2.2).
Figure 2.2
An example of governance layering to address needs at different
organizational levels.
Architectural Models
In addition to an understanding of governance methodologies, the chief
architect should also have an understanding of formal architectural frame-
works that can be used as fundamental models during the architectural
process. These frameworks can provide extraordinary resource, although
many carry an inherent bias toward specific technological viewpoints and
should be considered in that light. Formal enterprise architectural frame-
works include options such as the following.
• POSIX 1003.23.
One of the earliest formal frameworks for enter-
prise architecture, this standard was developed by the Institute of
