Java Reference
In-Depth Information
business use cases. Experience shows that the business use
cases are considered good candidates for exposure.
Existing asset analysis represents the bottom-up approach
where we analyze and leverage APIs, transactions and models
from legacy and packaged applications as possible candidate
services.
Goal-service modeling provides a middle-out approach that
relates services to goals, sub goals, KPIs and metrics of the
enterprise. This technique provides a certain level of
validation in the form of a completeness check and may
reveal candidate services that were not identified through the
top-down and bottom-up activities.
Finally, subsystem analysis expands on sub-systems
identified during domain decomposition and specifies
interdependencies and flows between them. A key aspect of
the identification step is that it employs a meet-in-the-middle
approach including a combination of top-down, bottom-up
and middle-out analysis techniques. In many cases a pure
bottom-up approach is taken, however, this approach
typically leads to poor definition of services that are driven
mainly by architecture of legacy application interfaces and
not from a business perspective.
