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“An object in OOA represents a single typical but unspecified instance of something in the real world - any airplane, I don't care which one, as long as it is typical. The object-oriented analyst distinguishes this concept from that of a specified instance: Airplane number N2713A, Air Force One, or The Spirit of St. Louis, for example.”

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Sally Shlaer

Quelle: Object-Oriented Systems Analysis: Modeling the World In Data (1988), p. 12

“While a small domain (consisting of fifty or fewer objects) can generally be analyzed as a unit, large domains must be partitioned to make the analysis a manageable task. To make such a partitioning, we take advantage of the fact that objects on an information model tend to fall into clusters: groups of objects that are interconnected with one another by many relationships. By contrast, relatively few relationships connect objects in different clusters.
When partitioning a domain, we divide the information model so that the clusters remain intact… Each section of the information model then becomes a separate subsystem. Note that when the information model is partitioned into subsystems, each object is assigned to exactly one subsystem.”

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Sally Shlaer

Quelle: Object-Oriented Systems Analysis: Modeling the World In Data (1988), p. 145; as cited in: The Object Agency, Inc. (1995) " A Comparison of Object-Oriented Development Methodologies http://www.ipipan.gda.pl/~marek/objects/TOA/OOMethod/mcr.html"