Furthermore, the subtraction method also allows downscaling cluster formations or purging cluster
members. Remember, clustering is an effective technique that simply facilitates services grouping
for problem-solving. Without subtraction capabilities the initial size of clusters cannot be aligned
when it is required.
148 Ch. 7 Service-Oriented Discovery and Analysis: Implementation Mechanisms
SUBTRACTION ANALYSIS MOTIVATION. When should the subtraction analysis be used? The
most common use of the subtraction analysis process is for aligning asset structures with changes
in business requirements or with alterations to business strategies and mission. These cases require
the elimination of unnecessary processes that have ceased promoting the business, or removal
of redundant business or technology process functionality. Moreover, design and architectural
requirements often call for renewed performance optimization activities that frequently result in
the isolation of irrelevant entities that no longer contribute to technical solutions. Similarly, these
disciplines should also apply when analyzing service clusters. Subtraction analysis activities can
also take place to align cluster structures with new business and technology requirements.
SUBTRACTION ANALYSIS PROCESS. The subtraction analysis process can be applied on an
atomic service only if its structure consists of redundant business or technological functionality,
or is comprised of unnecessary processes.
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