2.2 Fortress“Ally DiagramA 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 :
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