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Michael Bell

"Service-Oriented Modeling (SOA): Service Analysis, Design, and Architecture"


Partitioned Business Levels. An organization may find it compelling to divide a single business
layer into smaller business components, each of which executes a smaller portion of business
functionality. This can be achieved by breaking down a layer into several smaller domains (known
as partitioned levels), each of which becomes a business entity that is positioned on the layer
beneath. Exhibit 10.6 illustrates this idea. The equity accounts, mutual fund accounts, and the
money market accounts domains are treated as three separate entities. Note that these three
domains are located on the same level and live within the boundary of the greater domain layer
beneath??”the investment account domain.
Breaking down a layer into multiple smaller, equally treated domains, as depicted in
Exhibit 10.6, can encourage organizations to view their businesses horizontally rather than vertically.
That is because a layered structure is a hierarchical formation that represents vertical
business relationships. Separating domain layers, however, into smaller entities enables an organization
to create horizontal views of its business by discerning larger operations into smaller
business units.
Overlapping Domain Structure. Finally, most organizations recognize that domains are not
always self-contained. Domains may rely on their peers to augment some of their business
Investments
Domain Investment
Accounts
Domain
Mutual Funds
Accounts
Domain
Equity
Accounts
Domain
Money Market
Accounts
Domain
EXHIBIT 10.


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