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4. Adding Associations and Navigability
 In a design class diagram, associations are chosen by
a Spartan software-oriented, need-to-know criterion
i.e. what associations are required to satisfy visibility
needs indicated by the interaction diagrams.
 This is in contrast with associations in the conceptual
model, which may be justified by the intention to
enhance comprehension of the problem domain.
 Here are common situations suggesting a need to
define an association:
 A sends a message to B.
 A creates an instance B.
 A needs to maintain a connection to B.