Functionality removal from a composite service should be meticulously planned. Study
the business and technology correlations between the internal aggregated services to ensure the
business integrity and continuity of the remaining functions after the subtraction operation takes
place. Also be aware of the structural formations and the relationship upon which the internal
services are established. Remember, a composite service internal hierarchical relationship is
typically founded upon mutual dependencies between parent and offspring services. Thus, this
analysis operation should not alter the internal associations and functionality of the remaining
assets in the hierarchy.
The same rule applies when subtracting sections from service clusters. Inspect these
groups??™ internal interactions and communications before eliminating portions of their processes.
Exhibit 7.18 depicts a subtraction activity on a standard cluster formation. The financial planning
service and the financial analysis service are removed from the accounting and CPA services cluster.
These retired entities offer certified public accountant (CPA) analysis and planning services,
which are not transformed into the proposed solution??”the accounting services cluster.
SUBTRACTION ANALYSIS USE CASE. Now, consider a business case that represents a subtraction
analysis operation on a composite service. Exhibit 7.19 illustrates the removal of a retirement
account service from a general portfolio service.
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