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© Copyright IBM Corp. 2008. All rights reserved. 79
Chapter 5. Understanding distribution
of responsibility
In the previous two chapters, we have examined the general transformation from
looking at the system as a black box to looking at it as a white box, and
understanding its context, its collaboration with other entities, and the distribution
of responsibilities across logical entities in both the black-box and white-box
perspectives. In doing so, we have concentrated primarily on the logical
viewpoint. In this chapter, we turn our focus to the distribution viewpoint.
Joint realization is the MDSD technique for integrating various viewpoints in one
table, allowing us to reason about systems concerns across as many viewpoints
as necessary. Localities are the means for reasoning visually about distribution of
logical responsibilities to locations where processing will take place. We discuss
them first.
5