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Software Fortresses: Modeling Enterprise Architectures by Janet Van Sickler, Roger Sessions

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2.2. Fortress–Ally Diagram

A single fortress by itself is not very interesting. It is the relationship between fortresses that defines the enterprise architecture. A fortress–ally diagram (FAD) shows all of the enterprise fortresses and the ally relationships between them. Figure 2.2 shows an example of a FAD for a bill payment system.

Figure 2.2. A Sample FAD

The important features of a FAD are as follows:

  • Each fortress should be identified with a name and a type in the format name::type so that the appropriate fortress overview can be consulted for more detail.

  • Each drawbridge should be identified (with either labeled arrows or boxes) so that ...

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