A Layered Business Abstraction. Similarly to the OSI model, layers of domains can also
communicate a unique business formation. Conceive of a business domain layer as an area
of organizational interest, or a zone, which generates revenue driven by the enterprise business
model and strategies. Associated business domain layers, however, should be stacked up not only
to depict their relationship, but also to illustrate their business abstraction level.
Exhibit 10.2 exemplifies the business domain layer scheme. The bottom layer represents
the small-business domain, the middle layer depicts the small-business credit domain, and the
top layer is the small-business credit-card domain. These three layers are associated by their
small-business domain expertise. The bottom level??”the small-business domain??”is the most
generic layer in the hierarchy. Moving upstream, one encounters the smaller and more granular
business layers that provide more business detail.
Hierarchical Business View. What ties these levels together? What is the concept that unifies
all these components? Obviously, the very bottom layer is the base domain level that supports
the layers above it in this structure. It is also the most generalized business abstraction that
provides boundaries of execution for all the confined levels situated on top. Take, for example,
the small-business domain level, which provides direction and strategy for all its subordinate
layers located above it, as depicted in Exhibit 10.
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