The proposed solution yields a composite portfolio
service with the contained individual account service and the business account service. Note
that this business case commends the abolition of a composite service, which resides within
a larger service. The resulting service retains its composite structure because of the remaining
untouched services.
Business problem domain: Our recent market and client segmentation studies reveal that our customers prefer
our business and individual accounts offerings over the few retirement products we propose. Our current
limited resources and budgets would hamper our efforts to compete and show a profit.
Solution proposition: Reduce our portfolio management offerings by discontinuing the retirement
products we offer.
SUBTRACTION ANALYSIS BEST PRACTICES. Finally, be aware of composite and atomic service
granularity levels when performing subtraction analysis. The rule of thumb suggests that the most
effective results can be achieved when downsizing coarse-grained services. Therefore, avoid
slicing fine-grained entities because that process may substantially limit their contribution to the
solution. Unlike the decomposition analysis, elimination of functionality would not necessarily
Solution
Journal Entry
Service
Accounts
Receivable
Ledger
Service
Composite
Atomic Atomic
Accounts
Payable
Ledger
Service
Bank
Reconciliation
Service
Atomic
Tax
Reporting
Service
Atomic
Financial
Planning
Service
Atomic
Payroll
Processing
Service
Atomic
Accounting and CPA Service Cluster
General
Ledger
Service
Atomic
Financial
Analysis
Service
Atomic
Journal Entry
Service
Accounts
Receivable
Ledger
Service
Atomic Atomic
Accounts
Payable
Ledger
Service
Bank
Reconciliation
Service
Atomic
Tax
Reporting
Service
Atomic
Payroll
Processing
Service
Atomic
Accounting Services Cluster
General
Ledger
Service
Atomic
Composite
EXHIBIT 7.
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