Models as System Views

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Models as System Views

• UML models present different views of systems
• Evolution of system effected by evolving models
  (views)
• Requires well defined relationships between
  models
• requires well defined notions of
  realization/refinement/abstraction

Rigorous Model Engineering Part 1-Precise
Semantics for UML Models Robert France Associate
Professor Colorado State University
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System Views
Rigorous Model Engineering Part 1- Precise
Semantics for UML Models Robert France Associate
Professor Colorado State University
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Conceptual Model ExampleOrder Processing System
(OPS)
Rigorous Model Engineering Part 1- Precise
Semantics for UML Models Robert France Associate
Professor Colorado State University
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UML Forms of Aggregation

• Composition (strong aggregation)
• parts are existent-dependent on the whole
• parts are generated at the same time, before, or
  after the whole is created (depending on
  cardinality at whole end) and parts are deleted
  before or at the same time the whole dies
• multiplicity at whole end must be 1 or 0..1
• (weak) Aggregation everything else!

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Journal of Information Technology Impact Vol. 3
No. 1 pp. 25-55, 2003 The Impact of UML Class
Diagrams on Knowledge Modelling, Disovery
andPpresentations. Czejdo, Mappus, Mesa
Examples of aggregate relationships. Numbered
process are preliminary and are later replaced
by formal notation.
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