Concept: Functional Area Analysis and Concept: Business Subsystem (or Business Service Interface) describe how
business subsystems abstractly represent aggregations of cohesive business functionality. These are
not IT assets and are not deployable into the IT infrastructure; they provide a bridge between the business and IT
perspectives. Each business subsystem (or a functional area, if it has no business subsystems) is mapped into
an IT subsystem, which then is realized by one or more Service Components.
A Service Component is an enterprise-scale asset (a managed software element with guaranteed availability, load
balancing, security, performance, and versioning). The Service Component is in turn realized by multiple Functional and
Technical Components according to the diagram below.
Generally, each service assigned to a subsystem will result in a service component; functional and technical
components can be shared between service components within the same business subsystem.
See Guideline: Service Component Patterns for examples of five common patterns
for realizing service components.
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