Business-domain layers and tiers also offer opportunities to conceptualize enterprise business
architecture. These business constructs enable modeling an organization??™s business execution
in terms of its offerings, communication between domains, and propagation of management and
control. Thus, ahead of service-oriented business integration, the organization??™s domain formations
should be studied to find appropriate alignment opportunities for services.
BUSINESS DOMAIN INTEGRATION LAYERED STRUCTURE. The layered architecture notion is
not a new concept. There are many compelling reasons why software engineers would visualize
a system as a collection of stacked levels that collaborate to provide collective solutions. In the
late 1970s, the International Standards Organization (ISO) proposed an abstraction networking
layered model known as Open System Interconnection (OSI). This layered networking abstraction
describes seven levels that a user can use to access information on a network.1 The very top level
represents the user interface and the application layer, and the bottom level represents the physical
media. A layered business domain, however, is not a technical entity. This business structure
describes an organization formation or even a product and its internal constituents. Therefore, the
structural layered concept describes a business domain as a hierarchical entity that consists of
internal subordinate sub-domains.
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