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Association provides description of a connection among instances of classes.
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Most common kind of association is a binary association between a pair of classes.
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Associations carry information about relationships among objects in a system.
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As a system executes, links among objects are created and destroyed.
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Associations are the glue that ties a system together.
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Without associations, there are nothing but isolated classes that don't work together.
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Most important property of association is multiplicity.
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Multiplicity specifies how many instances of one class can be related to one instance of the other class.