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An initial set of data entities and attributes is discovered using noun extraction from the use case
descriptions or, if there is one, from the data dictionary. These are added to logical data model class
diagram(s). The meaning, types and constraints of the attributes may also be defined. Associations
are added between the classes including multiplicity and association names or role names. The
model may be refined with the addition of association classes, aggregation, composition and
generalisation where appropriate.
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